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Parent Corporation Statements of Income (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Revenues:                      
Dividends Paid to Parent Company                 $ (61,000)    
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
Realized Investment Gains (Losses)                 (4,937) 13,171 26,599
Other income                 8,881 7,456 16,945
Total revenues                 2,284,270 2,131,852 2,034,861
Expenses:                      
Interest expense                 22,771 22,428 23,063
Other expenses                 42,989 38,371 32,696
Total expenses                 2,064,315 1,899,160 1,837,730
Federal income tax benefit:                      
Current                 48,581 45,347 28,415
Deferred                 12,879 21,484 26,889
Total federal income tax expense                 61,460 66,831 55,304
Net income $ 39,360 $ 38,502 $ 43,601 $ 37,032 $ 45,389 $ 46,996 $ 33,768 $ 39,708 158,495 165,861 141,827
Parent Company [Member]                      
Revenues:                      
Dividends Paid to Parent Company                 61,014 57,752 57,511
Net investment income earned                 1,259 852 620
Realized Investment Gains (Losses)                 (220) 0 2
Other income                 0 0 340
Total revenues                 62,053 58,604 58,473
Expenses:                      
Interest expense                 24,030 24,057 24,817
Other expenses                 35,020 28,393 23,598
Total expenses                 59,050 52,450 48,415
Income before federal income tax                 3,003 6,154 10,058
Federal income tax benefit:                      
Current                 (17,924) (16,609) (15,920)
Deferred                 (2,143) (1,603) (646)
Total federal income tax expense                 (20,067) (18,212) (16,566)
Net income before equity in undistributed income of subsidiaries                 23,070 24,366 26,624
Equity In Undistributed Income Of Continuing Subsidiaries, Net Of Tax                 135,425 141,495 115,203
Net income                 $ 158,495 $ 165,861 $ 141,827