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Unaudited Selected Quarterly Financial Data (Details) (USD $)
In Thousands, except 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, 2010
Sep. 30, 2010
Jun. 30, 2010
Mar. 31, 2010
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Selected quarterly financial data                              
Insurance premiums written and contract deposits $ 279,479 $ 285,206 $ 260,289 $ 242,753 $ 276,113 $ 298,910 $ 259,324 $ 244,102 $ 269,173 $ 289,316 $ 254,766 $ 238,706 $ 1,067,727 $ 1,078,449 $ 1,051,961
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
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
Basic                              
Net income (loss) per share - basic $ 0.81 $ 0.82 $ 0.33 $ 0.67 $ 0.82 $ 0.59 $ (0.30) $ 0.65 $ 0.37 $ 0.50 $ 0.60 $ 0.57 $ 2.63 $ 1.77 $ 2.04
Shares of common stock - weighted average (1) 39,339 39,381 39,544 39,794 39,900 39,919 39,893 39,749 39,514 39,411 39,263 39,206 39,513,540 39,865,815 39,349,656
Diluted                              
Net income (loss) per share - diluted $ 0.77 $ 0.78 $ 0.32 $ 0.64 $ 0.79 $ 0.57 $ (0.30) $ 0.62 $ 0.35 $ 0.48 $ 0.57 $ 0.54 $ 2.51 $ 1.70 $ 1.95
Shares of common stock and equivalent shares - weighted average (1) 41,272 41,138 41,304 41,546 41,414 41,451 39,893 41,699 41,253 41,115 40,929 40,900 41,388,368 41,436,512 41,013,163