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Quarterly Financial Information (Details)
$ / shares in Units, $ in Thousands
 1 Months Ended 3 Months Ended 12 Months Ended
Feb. 14, 2017
Dec. 31, 2016
USD ($)
$ / shares
Sep. 30, 2016
USD ($)
$ / shares
Jun. 30, 2016
USD ($)
$ / shares
Mar. 31, 2016
USD ($)
$ / shares
Dec. 31, 2015
USD ($)
$ / shares
Sep. 30, 2015
USD ($)
$ / shares
Jun. 30, 2015
USD ($)
$ / shares
Mar. 31, 2015
USD ($)
$ / shares
Dec. 31, 2016
USD ($)
$ / shares
Dec. 31, 2015
USD ($)
$ / shares
Dec. 31, 2014
USD ($)
$ / shares
Net premiums earned   $ 552,753 $ 542,429 $ 531,932 $ 522,458 $ 516,087 $ 507,390 $ 490,309 $ 476,123 $ 2,149,572 $ 1,989,909 $ 1,852,609
Net investment income earned   35,428 33,375 31,182 30,769 30,108 32,061 32,230 26,917 130,754 121,316 138,708
Net realized (losses) gains   (7,686) 3,688 1,765 (2,704) (2,600) 308 (3,420) 18,883 3,562 31,537 37,703
Underwriting income   35,168 32,033 43,777 40,955 49,053 44,831 29,124 26,021      
Net income   39,360 38,502 43,601 37,032 45,389 46,996 33,768 39,708 158,495 165,861 141,827
Other comprehensive income (loss)   (78,159) (9,798) 36,010 45,422 (3,386) 6,290 (35,944) 3,827 (6,525) (29,213) (5,063)
Comprehensive income (loss)   $ (38,799) $ 28,704 $ 79,611 $ 82,454 $ 42,003 $ 53,286 $ (2,176) $ 43,535 $ 151,970 $ 136,648 $ 136,764
Basic net income per share | $ / shares   $ 0.68 $ 0.66 $ 0.75 $ 0.64 $ 0.79 $ 0.82 $ 0.59 $ 0.70 $ 2.74 $ 2.90 $ 2.52
Diluted net income per share | $ / shares   0.67 0.66 0.74 0.63 0.78 0.81 0.58 0.69 2.70 2.85 2.47
Dividends to stockholders | $ / shares   $ 0.16 [1] $ 0.15 [1] $ 0.15 [1] $ 0.15 [1] $ 0.15 [1] $ 0.14 [1] $ 0.14 [1] $ 0.14 [1] $ 0.61 $ 0.57 $ 0.53
Price range common stock, high 44.35 44.00 [2] 41.30 [2] 38.67 [2] 36.92 [2] 37.91 [2] 32.50 [2] 29.60 [2] 30.10 [2]      
Price range of common stock, low 38.50 34.95 [2] 35.90 [2] 33.60 [2] 29.27 [2] 30.36 [2] 28.10 [2] 26.28 [2] 25.49 [2]      
Accumulated other comprehensive income (loss) [Member]                        
Other comprehensive income (loss)                   $ (6,525) $ (29,213) $ (5,063)
[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 3, 2017 and ending February 14, 2017 was $38.50 to $44.35.