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Parent Corporation Statements of Income (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Revenues:                      
Dividends Paid to Parent Company                 $ (57,800)    
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
Other income                 7,456 16,945 12,294
Total revenues                 2,131,852 2,034,861 1,903,741
Expenses:                      
Interest expense                 22,428 23,063 26,361
Other expenses                 38,371 32,696 31,863
Total expenses                 1,899,160 1,837,730 1,759,939
Federal income tax benefit:                      
Current                 45,347 28,415 24,147
Deferred                 21,484 26,889 12,240
Total federal income tax expense                 66,831 55,304 36,387
Net income from continuing operations                 165,861 141,827 107,415
Loss on disposal of discontinued operations                 0 0 (997)
Net income $ 45,389 $ 46,996 $ 33,768 $ 39,708 $ 41,350 $ 53,162 $ 29,341 $ 17,974 165,861 141,827 106,418
Parent Company [Member]                      
Revenues:                      
Dividends Paid to Parent Company                 57,752 57,511 32,129
Net investment income earned                 852 620 585
Other income                 0 342 55
Total revenues                 58,604 58,473 32,769
Expenses:                      
Interest expense                 24,057 24,817 28,132
Other expenses                 28,393 23,598 24,065
Total expenses                 52,450 48,415 52,197
Income (loss) from continuing operations, before federal income tax                 6,154 10,058 (19,428)
Federal income tax benefit:                      
Current                 (16,609) (15,920) (22,779)
Deferred                 (1,603) (646) 4,835
Total federal income tax expense                 (18,212) (16,566) (17,944)
Net income (loss) from continuing operations before equity in undistributed income of subsidiaries                 24,366 26,624 (1,484)
Equity In Undistributed Income Of Continuing Subsidiaries, Net Of Tax                 141,495 115,203 108,899
Net income from continuing operations                 165,861 141,827 107,415
Loss on disposal of discontinued operations                 0 0 (997)
Net income                 $ 165,861 $ 141,827 $ 106,418