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Quarterly Financial Information (Details)
$ / shares in Units, $ in Thousands
 1 Months Ended 3 Months Ended 12 Months Ended
Feb. 12, 2016
Dec. 31, 2015
USD ($)
$ / shares
Sep. 30, 2015
USD ($)
$ / shares
Jun. 30, 2015
USD ($)
$ / shares
Mar. 31, 2015
USD ($)
$ / shares
Dec. 31, 2014
USD ($)
$ / shares
Sep. 30, 2014
USD ($)
$ / shares
Jun. 30, 2014
USD ($)
$ / shares
Mar. 31, 2014
USD ($)
$ / shares
Dec. 31, 2015
USD ($)
$ / shares
Dec. 31, 2014
USD ($)
$ / shares
Dec. 31, 2013
USD ($)
$ / shares
Net premiums earned   $ 516,087 $ 507,390 $ 490,309 $ 476,123 $ 469,850 $ 462,639 $ 463,625 $ 456,495 $ 1,989,909 $ 1,852,609 $ 1,736,072
Net investment income earned   30,108 32,061 32,230 26,917 32,108 34,292 36,774 35,534 121,316 138,708 134,643
Net realized gains (losses)   (2,600) 308 (3,420) 18,883 (389) 15,231 4,539 7,218 31,537 37,703 26,375
Underwriting income (loss), before federal income tax   49,053 44,831 29,124 26,021 38,637 34,437 10,084 (5,015)      
Net income from continuing operations                   165,861 141,827 107,415
Net income   45,389 46,996 33,768 39,708 41,350 53,162 29,341 17,974 165,861 141,827 106,418
Other comprehensive income (loss)   (3,386) 6,290 (35,944) 3,827 (29,337) (18,887) 26,483 16,678 (29,213) (5,063) (29,189)
Comprehensive income   $ 42,003 $ 53,286 $ (2,176) $ 43,535 $ 12,013 $ 34,275 $ 55,824 $ 34,652 $ 136,648 $ 136,764 $ 77,229
Basic net income per share | $ / shares   $ 0.79 $ 0.82 $ 0.59 $ 0.70 $ 0.73 $ 0.94 $ 0.52 $ 0.32 $ 2.90 $ 2.52 $ 1.91
Diluted net income per share | $ / shares   0.78 0.81 0.58 0.69 0.72 0.93 0.51 0.31 2.85 2.47 1.87
Dividends to stockholders | $ / shares   $ 0.15 [1] $ 0.14 [1] $ 0.14 [1] $ 0.14 [1] $ 0.14 [1] $ 0.13 [1] $ 0.13 [1] $ 0.13 [1] $ 0.57 $ 0.53 $ 0.52
Price range common stock, high 34.00 37.91 [2] 32.50 [2] 29.60 [2] 30.10 [2] 27.65 [2] 25.46 [2] 25.42 [2] 26.99 [2]      
Price range of common stock, low 29.27 30.36 [2] 28.10 [2] 26.28 [2] 25.49 [2] 22.01 [2] 21.97 [2] 22.14 [2] 21.38 [2]      
Accumulated other comprehensive income (loss) [Member]                        
Other comprehensive income (loss)                   $ (29,213) $ (5,063) $ (29,189)
[1] 1 See Note 19. “Statutory Financial Information, Capital Requirements, and Restrictions on Dividends and Transfers of Funds” for a discussion of dividend restrictions.
[2] 2 These ranges of high and low prices of the Parent’s common stock, as reported by the NASDAQ Global Select Market, represent actual transactions. Price quotations do not include retail markups, markdowns, and commissions. The range of high and low prices for common stock for the period beginning January 4, 2016 and ending February 12, 2016 was $29.27 to $34.00.