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Quarterly Results for 2012 and 2011 (Unaudited) (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Summary of quarterly results for the periods presented                      
Net premiums earned $ 67,274 $ 59,512 $ 55,694 $ 48,640 $ 51,823 $ 49,634 $ 49,524 $ 48,004 $ 231,120 $ 198,985 $ 170,443
Investment income 278 215 (16) (36) 430 122 (21) 257 441 788 992
Total revenues 75,227 74,537 59,928 60,247 58,443 49,413 53,672 64,333 269,939 225,861 239,923
Total expenses 65,863 60,563 46,936 44,018 62,165 48,170 40,551 41,257 217,380 192,143 177,645
Net income $ 4,406 $ 8,256 $ 7,777 $ 9,873 $ (2,313) $ 975 $ 7,549 $ 13,898 $ 30,312 $ 20,109 $ 36,984
Basic earnings per share $ 0.11 $ 0.21 $ 0.20 $ 0.24 $ (0.06) $ 0.02 $ 0.19 $ 0.35 $ 0.76 $ 0.51 $ 0.95
Diluted earnings per common share $ 0.11 $ 0.20 $ 0.19 $ 0.24 $ (0.06) $ 0.02 $ 0.19 $ 0.34 $ 0.75 $ 0.50 $ 0.91