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Selected Quarterly Financial Data Revisions to Previously issued Unaudited Quarterly Consolidated Statements of Income (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
3 Months Ended 12 Months Ended 3 Months Ended 6 Months Ended 9 Months Ended 12 Months Ended 3 Months Ended 6 Months Ended 9 Months Ended 12 Months Ended
Dec. 31, 2012
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Sep. 30, 2012
As Previously Reported
Jun. 30, 2012
As Previously Reported
Mar. 31, 2012
As Previously Reported
Dec. 31, 2011
As Previously Reported
Sep. 30, 2011
As Previously Reported
Jun. 30, 2011
As Previously Reported
Mar. 31, 2011
As Previously Reported
Jun. 30, 2012
As Previously Reported
Jun. 30, 2011
As Previously Reported
Sep. 30, 2012
As Previously Reported
Sep. 30, 2011
As Previously Reported
Dec. 31, 2011
As Previously Reported
Dec. 31, 2010
As Previously Reported
Sep. 30, 2012
As Restated
Jun. 30, 2012
As Restated
Mar. 31, 2012
As Restated
Dec. 31, 2011
As Restated
Sep. 30, 2011
As Restated
Jun. 30, 2011
As Restated
Mar. 31, 2011
As Restated
Jun. 30, 2012
As Restated
Jun. 30, 2011
As Restated
Sep. 30, 2012
As Restated
Sep. 30, 2011
As Restated
Dec. 31, 2011
As Restated
Dec. 31, 2010
As Restated
Revenues                                                            
Net premiums earned $ 140,843 $ 501,464     $ 131,766 $ 118,955 $ 109,900 $ 100,268 $ 92,601 $ 88,128 $ 82,427 $ 228,855 $ 170,555 $ 360,621 $ 263,156 $ 363,424 $ 321,786 $ 131,766 $ 118,955 $ 109,900 $ 100,268 $ 92,601 $ 88,128 $ 82,427 $ 228,855 $ 170,555 $ 360,621 $ 263,156 $ 363,424 $ 321,786
Net investment income 18,175 72,363     17,506 18,297 18,385 19,734 19,584 20,306 20,493 36,682 40,799 54,188 60,383 80,117 83,032 17,506 18,297 18,385 19,734 19,584 20,306 20,493 36,682 40,799 54,188 60,383 80,117 83,032
Realized gains on investments, net 487 5,048     1,838 945 1,778 18,178 647 1,102 234 2,723 1,336 4,561 1,983 20,161 10,137 1,838 945 1,778 18,178 647 1,102 234 2,723 1,336 4,561 1,983 20,161 10,137
Other income 82 307     30 114 81 247 82 3 120 195 123 225 205 452 649 30 114 81 247 82 3 120 195 123 225 205 452 649
Total revenues 159,587 579,182     151,140 138,311 130,144 138,427 112,914 109,539 103,274 268,455 212,813 419,595 325,727 464,154 415,604 151,140 138,311 130,144 138,427 112,914 109,539 103,274 268,455 212,813 419,595 325,727 464,154 415,604
Expenses                                                            
Losses and loss adjustment expenses 22,760 287,910     98,255 88,293 80,923 73,654 67,438 64,150 59,421 169,216 123,571 267,471 191,009 264,663 194,779 96,823 87,809 80,518 73,031 66,846 63,601 59,033 168,327 122,634 265,150 189,480 262,511 193,297
Commission expense 18,462 65,580     14,865 16,147 13,529 13,134 10,968 11,119 10,281 29,676 21,400 44,541 32,368 45,502 38,468 16,681 16,621 13,816 13,729 11,520 11,607 10,488 30,437 22,095 47,118 33,615 47,344 39,280
Policyholder dividends 687 3,204     867 803 847 657 840 914 1,012 1,650 1,926 2,517 2,766 3,423 4,316 867 803 847 657 840 914 1,012 1,650 1,926 2,517 2,766 3,423 4,316
Underwriting and other operating expenses 30,505 121,440     29,280 29,513 32,142 23,505 25,334 26,200 25,678 61,655 51,878 90,935 77,212 100,717 106,026 29,280 29,513 32,142 23,505 25,334 26,200 25,678 61,655 51,878 90,935 77,212 100,717 106,026
Interest expense 848 3,504     896 858 902 911 906 908 917 1,760 1,825 2,656 2,731 3,642 5,693 896 858 902 911 906 908 917 1,760 1,825 2,656 2,731 3,642 5,693
Total expenses 73,262 481,638     144,163 135,614 128,343 111,861 105,486 103,291 97,309 263,957 200,600 408,120 306,086 417,947 349,282 144,547 135,604 128,225 111,833 105,446 103,230 97,128 263,829 200,358 408,376 305,804 417,637 348,612
Net income before income taxes 86,325 97,544     6,977 2,697 1,801 26,566 7,428 6,248 5,965 4,498 12,213 11,475 19,641 46,207 66,322 6,593 2,707 1,919 26,594 7,468 6,309 6,146 4,626 12,455 11,219 19,923 46,517 66,992
Income tax (benefit) expense (1,444) (9,347) (2,106) 3,523 (1,173) (2,309) (4,421) 6,632 (4,355) (2,003) (2,380) (6,730) (4,383) (7,903) (8,738) (2,106) 3,523 (1,173) (2,309) (4,421) 6,632 (4,355) (2,003) (2,380) (6,730) (4,383) (7,903) (8,738) (2,106) 3,523
Net income 87,769 106,891 48,623 63,469 8,150 5,006 6,222 19,934 11,783 8,251 8,345 11,228 16,596 19,378 28,379 48,313 62,799 7,766 5,016 6,340 19,962 11,823 8,312 8,526 11,356 16,838 19,122 28,661 48,623 63,469
Comprehensive income                                                            
Unrealized gains during the period (9,822) 16,111     16,045 3,844 6,044 12,734 16,935 18,866 (2,844) 9,888 16,022 25,933 32,957 45,691 6,910 16,045 3,844 6,044 12,734 16,935 18,866 (2,844) 9,888 16,022 25,933 32,957 45,691 6,910
Less: reclassification adjustment for realized gains in net income 316 3,281     1,195 614 1,156 11,816 421 716 152 1,771 868 2,966 1,289 13,105 6,589 1,195 614 1,156 11,816 421 716 152 1,771 868 2,966 1,289 13,105 6,589
Other comprehensive income, net of tax (10,138) 12,830     14,850 3,230 4,888 918 16,514 18,150 (2,996) 8,117 15,154 22,967 31,668 32,586 321 14,850 3,230 4,888 918 16,514 18,150 (2,996) 8,117 15,154 22,967 31,668 32,586 321
Total comprehensive income 77,631 119,721     23,000 8,236 11,110 20,852 28,297 26,401 5,349 19,345 31,750 42,345 60,047 80,899 63,120 22,616 8,246 11,228 20,880 28,337 26,462 5,530 19,473 31,992 42,089 60,329 81,209 63,790
Earnings per common share (Note 20):                                                            
EPS, basic $ 2.85 $ 3.40     $ 0.26 $ 0.16 $ 0.19 $ 0.58 $ 0.31 $ 0.21 $ 0.22 $ 0.35 $ 0.43 $ 0.61 $ 0.74 $ 1.30 $ 1.52 $ 0.25 $ 0.16 $ 0.19 $ 0.58 $ 0.31 $ 0.22 $ 0.22 $ 0.35 $ 0.44 $ 0.60 $ 0.75 $ 1.30 $ 1.53
EPS, diluted $ 2.82 $ 3.37     $ 0.26 $ 0.16 $ 0.19 $ 0.58 $ 0.31 $ 0.21 $ 0.21 $ 0.35 $ 0.43 $ 0.61 $ 0.74 $ 1.29 $ 1.51 $ 0.25 $ 0.16 $ 0.19 $ 0.58 $ 0.31 $ 0.22 $ 0.22 $ 0.35 $ 0.43 $ 0.60 $ 0.75 $ 1.30 $ 1.53
Cash dividends declared per common share $ 0.06 $ 0.24     $ 0.06 $ 0.06 $ 0.06 $ 0.06 $ 0.06 $ 0.06 $ 0.06 $ 0.12 $ 0.12 $ 0.18 $ 0.18 $ 0.24 $ 0.24 $ 0.06 $ 0.06 $ 0.06 $ 0.06 $ 0.06 $ 0.06 $ 0.06 $ 0.12 $ 0.12 $ 0.18 $ 0.18 $ 0.24 $ 0.24
Realized gains on investments, net                                                            
Net realized gains on investments before credit related impairments on fixed maturity securities 611 5,700     1,838 1,005 2,246 18,272 647 1,102 234 3,252 1,336 5,090 1,983 20,255 10,182 1,838 1,005 2,246 18,272 647 1,102 234 3,252 1,336 5,090 1,983 20,255 10,182
Other than temporary impairment, credit losses recognized in earnings (124) 652     0 (60) (468) (94) 0 0 0 (529) 0 529 0 94 45 0 (60) (468) (94) 0 0 0 (529) 0 529 0 94 45
Portion of impairment recognized in other comprehensive income 0 0     0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
Realized gains on investments, net $ 487 $ 5,048 $ 20,161 $ 10,137 $ 1,838 $ 945 $ 1,778 $ 18,178 $ 647 $ 1,102 $ 234 $ 2,723 $ 1,336 $ 4,561 $ 1,983 $ 20,161 $ 10,137 $ 1,838 $ 945 $ 1,778 $ 18,178 $ 647 $ 1,102 $ 234 $ 2,723 $ 1,336 $ 4,561 $ 1,983 $ 20,161 $ 10,137