| Philadelphia Financial Management of San Francisco, LLC | 
                    0.00% | 
                    21 Feb 2018 | 
                
        
                
                    | Philadelphia Financial Management of San Francisco, LLC | 
                    1.01% | 
                    20 Feb 2018 | 
                
        
                
                    | Philadelphia Financial Management of San Francisco, LLC | 
                    1.26% | 
                    14 Feb 2018 | 
                
        
                
                    | Philadelphia Financial Management of San Francisco, LLC | 
                    1.37% | 
                    19 Jan 2018 | 
                
        
                
                    | Philadelphia Financial Management of San Francisco, LLC | 
                    1.24% | 
                    29 Nov 2017 | 
                
        
                
                    | Philadelphia Financial Management of San Francisco, LLC | 
                    1.13% | 
                    20 Oct 2017 | 
                
        
                
                    | Philadelphia Financial Management of San Francisco, LLC | 
                    0.97% | 
                    19 Oct 2017 | 
                
        
                
                    | JPMorgan Asset Management (UK) Ltd | 
                    0.48% | 
                    27 Oct 2015 | 
                
        
                
                    | JPMorgan Asset Management (UK) Ltd | 
                    0.58% | 
                    22 Oct 2015 | 
                
        
                
                    | JPMorgan Asset Management (UK) Ltd | 
                    0.62% | 
                    14 Sep 2015 | 
                
        
                
                    | JPMorgan Asset Management (UK) Ltd | 
                    0.51% | 
                    8 Sep 2015 | 
                
        
                
                    | AlphaGen Capital Limited | 
                    0.33% | 
                    7 Sep 2015 | 
                
        
                
                    | AlphaGen Capital Limited | 
                    0.55% | 
                    4 Sep 2015 | 
                
        
                
                    | AlphaGen Capital Limited | 
                    0.49% | 
                    3 Sep 2015 | 
                
        
                
                    | AlphaGen Capital Limited | 
                    0.80% | 
                    28 Aug 2015 | 
                
        
                
                    | AlphaGen Capital Limited | 
                    0.77% | 
                    25 Aug 2015 | 
                
        
                
                    | AlphaGen Capital Limited | 
                    0.80% | 
                    24 Aug 2015 | 
                
        
                
                    | AlphaGen Capital Limited | 
                    0.79% | 
                    21 Aug 2015 | 
                
        
                
                    | AlphaGen Capital Limited | 
                    0.82% | 
                    11 Aug 2015 | 
                
        
                
                    | AlphaGen Capital Limited | 
                    0.72% | 
                    3 Aug 2015 | 
                
        
                
                    | AlphaGen Capital Limited | 
                    0.90% | 
                    30 Jul 2015 | 
                
        
                
                    | AlphaGen Capital Limited | 
                    0.82% | 
                    20 Jul 2015 | 
                
        
                
                    | AlphaGen Capital Limited | 
                    0.70% | 
                    14 Jul 2015 | 
                
        
                
                    | AlphaGen Capital Limited | 
                    0.61% | 
                    26 Jun 2015 | 
                
        
                
                    | AlphaGen Capital Limited | 
                    0.57% | 
                    25 Jun 2015 | 
                
        
                
                    | AlphaGen Capital Limited | 
                    0.60% | 
                    24 Jun 2015 | 
                
        
                
                    | AlphaGen Capital Limited | 
                    0.58% | 
                    17 Jun 2015 | 
                
        
                
                    | AlphaGen Capital Limited | 
                    0.64% | 
                    29 May 2015 | 
                
        
                
                    | AlphaGen Capital Limited | 
                    0.77% | 
                    18 May 2015 | 
                
        
                
                    | AlphaGen Capital Limited | 
                    0.82% | 
                    7 May 2015 | 
                
        
                
                    | AlphaGen Capital Limited | 
                    0.76% | 
                    28 Apr 2015 | 
                
        
                
                    | AlphaGen Capital Limited | 
                    0.80% | 
                    24 Apr 2015 | 
                
        
                
                    | AlphaGen Capital Limited | 
                    0.77% | 
                    20 Apr 2015 | 
                
        
                
                    | AlphaGen Capital Limited | 
                    0.82% | 
                    17 Apr 2015 | 
                
        
                
                    | AlphaGen Capital Limited | 
                    0.79% | 
                    16 Apr 2015 | 
                
        
                
                    | AlphaGen Capital Limited | 
                    0.80% | 
                    9 Apr 2015 | 
                
        
                
                    | AlphaGen Capital Limited | 
                    0.77% | 
                    30 Mar 2015 | 
                
        
                
                    | AlphaGen Capital Limited | 
                    0.81% | 
                    13 Mar 2015 | 
                
        
                
                    | AlphaGen Capital Limited | 
                    0.79% | 
                    20 Feb 2015 | 
                
        
                
                    | AlphaGen Capital Limited | 
                    0.89% | 
                    16 Feb 2015 | 
                
        
                
                    | AlphaGen Capital Limited | 
                    0.93% | 
                    13 Feb 2015 | 
                
        
                
                    | AlphaGen Capital Limited | 
                    0.88% | 
                    11 Feb 2015 | 
                
        
                
                    | AlphaGen Capital Limited | 
                    0.93% | 
                    30 Jan 2015 | 
                
        
                
                    | AlphaGen Capital Limited | 
                    0.83% | 
                    21 Jan 2015 | 
                
        
                
                    | AlphaGen Capital Limited | 
                    0.95% | 
                    15 Jan 2015 | 
                
        
                
                    | AlphaGen Capital Limited | 
                    1.00% | 
                    13 Jan 2015 | 
                
        
                
                    | AlphaGen Capital Limited | 
                    0.90% | 
                    31 Dec 2014 | 
                
        
                
                    | ODEY ASSET MANAGEMENT LLP | 
                    0.49% | 
                    22 Dec 2014 | 
                
        
                
                    | AlphaGen Capital Limited | 
                    0.82% | 
                    16 Dec 2014 | 
                
        
                
                    | AlphaGen Capital Limited | 
                    0.70% | 
                    9 Dec 2014 | 
                
        
                
                    | ODEY ASSET MANAGEMENT LLP | 
                    0.57% | 
                    3 Dec 2014 | 
                
        
                
                    | AlphaGen Capital Limited | 
                    0.62% | 
                    1 Dec 2014 | 
                
        
                
                    | AlphaGen Capital Limited | 
                    0.51% | 
                    18 Nov 2014 | 
                
        
                
                    | ODEY ASSET MANAGEMENT LLP | 
                    0.69% | 
                    4 Aug 2014 | 
                
        
                
                    | ODEY ASSET MANAGEMENT LLP | 
                    0.74% | 
                    19 Jul 2013 | 
                
        
                
                    | ODEY ASSET MANAGEMENT LLP | 
                    0.69% | 
                    18 Jul 2013 | 
                
        
                
                    | Philadelphia Financial Management of San Francisco, LLC | 
                    0.48% | 
                    18 Jul 2013 | 
                
        
                
                    | Philadelphia Financial Management of San Francisco, LLC | 
                    0.76% | 
                    27 Jun 2013 | 
                
        
                
                    | Philadelphia Financial Management of San Francisco, LLC | 
                    0.86% | 
                    26 Mar 2013 | 
                
        
                
                    | Philadelphia Financial Management of San Francisco, LLC | 
                    0.73% | 
                    27 Feb 2013 | 
                
        
                
                    | Philadelphia Financial Management of San Francisco, LLC | 
                    0.58% | 
                    22 Feb 2013 | 
                
        
                
                    | AlphaGen Capital Limited | 
                    0.46% | 
                    21 Feb 2013 | 
                
        
                
                    | Philadelphia Financial Management of San Francisco, LLC | 
                    0.55% | 
                    21 Feb 2013 | 
                
        
                
                    | Philadelphia Financial Management of San Francisco, LLC | 
                    0.53% | 
                    20 Feb 2013 | 
                
        
                
                    | JPMorgan Asset Management (UK) Ltd | 
                    0.31% | 
                    14 Feb 2013 | 
                
        
                
                    | AlphaGen Capital Limited | 
                    0.52% | 
                    13 Feb 2013 | 
                
        
                
                    | JPMorgan Asset Management (UK) Ltd | 
                    0.58% | 
                    29 Nov 2012 |