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Quarterly Results of Operations (unaudited) (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Summary of unaudited quarterly results of operations                      
Net premiums earned $ 164,874 $ 182,085 $ 175,293 $ 171,899 $ 174,670 $ 177,028 $ 176,303 $ 171,730 $ 694,149 $ 699,731 $ 527,919
Net losses and loss adjustment expenses:                      
Current year 149,157 145,027 139,057 138,654 124,271 142,124 141,126 137,647 571,891 545,168 447,510
Favorable development of reserves established in prior years, net (56,330) (36,221) (35,115) (33,514) (48,830) (42,902) (42,213) (48,139) (161,180) (182,084) (222,749)
Net income $ 34,948 $ 10,276 $ 33,158 $ 37,814 $ 65,114 $ 34,778 $ 49,942 $ 46,731 $ 116,197 $ 196,565 $ 297,523
Basic earnings per share (USD per share) $ 0.66 $ 0.19 $ 0.60 $ 0.67 $ 1.13 $ 0.59 $ 0.84 $ 0.76 $ 2.12 $ 3.32 $ 4.82
Diluted earnings per share (USD per share) $ 0.65 $ 0.19 $ 0.60 $ 0.67 $ 1.12 $ 0.59 $ 0.84 $ 0.76 $ 2.11 $ 3.30 $ 4.80