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Summary of Significant Accounting Policies (Details 8) (USD $)
In Thousands, 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, 2010
Sep. 30, 2010
Jun. 30, 2010
Mar. 31, 2010
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Balance Sheet Related Disclosures                              
Deferred policy acquisition costs $ 196,885       $ 216,456       $ 222,177       $ 196,885 $ 216,456 $ 222,177
Total assets 8,167,726       7,435,169       6,945,662       8,167,726 7,435,169 6,945,662
Other liabilities 445,952       352,800       287,252       445,952 352,800 287,252
Total liabilities 6,921,923       6,379,816       6,098,575       6,921,923 6,379,816 6,098,575
Retained earnings 921,969       840,644       789,128       921,969 840,644 789,128
Net unrealized gains and losses on fixed maturities and equity securities 382,400       268,222       111,268       382,400 268,222 111,268
Total shareholders' equity 1,245,803       1,055,353       847,087       1,245,803 1,055,353 847,087
Income Statement Related Disclosures                              
Total revenues 255,417 256,548 254,226 244,623 247,645 260,833 245,351 244,473 237,997 250,030 248,014 238,673 1,010,814 998,302 974,714
Policy acquisition expenses amortized                         79,519 83,398 77,347
Operating expenses                         156,058 148,635 151,690
Total benefits, losses and expenses                         861,641 903,384 864,546
Income before income taxes                         149,173 94,918 110,168
Income tax expense                         45,307 24,412 30,037
Net income 31,826 32,266 13,103 26,671 32,913 23,637 (11,851) 25,807 14,592 19,886 23,381 22,272 103,866 70,506 80,131
As Originally Reported [Member]
                              
Balance Sheet Related Disclosures                              
Deferred policy acquisition costs         265,041       272,825         265,041 272,825
Total assets         7,483,737       6,996,300         7,483,737 6,996,300
Other liabilities         369,800       304,977         369,800 304,977
Total liabilities         6,396,811       6,116,293         6,396,811 6,116,293
Retained earnings         875,069       823,579         875,069 823,579
Net unrealized gains and losses on fixed maturities and equity securities         265,370       109,737         265,370 109,737
Total shareholders' equity         1,086,926       880,007         1,086,926 880,007
Income Statement Related Disclosures                              
Total revenues                           998,300 974,711
Policy acquisition expenses amortized                           92,128 85,056
Operating expenses                           139,936 142,852
Total benefits, losses and expenses                           903,422 863,420
Income before income taxes                           94,878 111,291
Income tax expense                           24,398 30,429
Net income                           70,480 80,862
Effect of Change [Member]
                              
Balance Sheet Related Disclosures                              
Deferred policy acquisition costs         (48,585)       (50,648)         (48,585) (50,648)
Total assets         (48,568)       (50,638)         (48,568) (50,638)
Other liabilities         (17,000)       (17,725)         (17,000) (17,725)
Total liabilities         (16,995)       (17,718)         (16,995) (17,718)
Retained earnings         (34,425)       (34,451)         (34,425) (34,451)
Net unrealized gains and losses on fixed maturities and equity securities         2,852       1,531         2,852 1,531
Total shareholders' equity         (31,573)       (32,920)         (31,573) (32,920)
Income Statement Related Disclosures                              
Total revenues                           2 3
Policy acquisition expenses amortized                           (8,730) (7,709)
Operating expenses                           8,699 8,838
Total benefits, losses and expenses                           (38) 1,126
Income before income taxes                           40 (1,123)
Income tax expense                           14 (392)
Net income                           $ 26 $ (731)