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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
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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

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