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Parent Corporation Statements of Income (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Revenues:                      
Dividends from subsidaries                 $ (80,100)    
Net investment income earned $ 42,587 $ 40,446 $ 41,430 $ 37,419 $ 35,428 $ 33,375 $ 31,182 $ 30,769 161,882 $ 130,754 $ 121,316
Realized Investment Gains (Losses)                 6,359 (4,937) 13,171
Total revenues 633,737 621,293 614,485 600,469 582,358 581,691 568,747 551,474 2,469,984 2,284,270 2,131,852
Expenses:                      
Interest expense                 24,354 22,771 22,428
Total expenses                 2,208,016 2,064,315 1,899,160
Federal income tax (benefit) expense:                      
Current                 62,184 48,581 45,347
Deferred                 30,958 12,879 21,484
Total federal income tax expense                 93,142 61,460 66,831
Net income $ 30,242 $ 46,718 $ 41,426 $ 50,440 $ 39,360 $ 38,502 $ 43,601 $ 37,032 168,826 158,495 165,861
Parent Company [Member]                      
Revenues:                      
Dividends from subsidaries                 80,096 61,014 57,752
Net investment income earned                 2,044 1,259 852
Realized Investment Gains (Losses)                 (15) (220) 0
Total revenues                 82,125 62,053 58,604
Expenses:                      
Interest expense                 24,721 24,030 24,057
Other expenses                 36,251 35,020 28,393
Total expenses                 60,972 59,050 52,450
Income before federal income tax                 21,153 3,003 6,154
Federal income tax (benefit) expense:                      
Current                 (22,187) (17,924) (16,609)
Deferred                 6,311 (2,143) (1,603)
Total federal income tax expense                 (15,876) (20,067) (18,212)
Net income before equity in undistributed income of subsidiaries                 37,029 23,070 24,366
Equity In Undistributed Income Of Continuing Subsidiaries, Net Of Tax                 131,797 135,425 141,495
Net income                 $ 168,826 $ 158,495 $ 165,861