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Parent Corporation Statements of Income (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2018
 [1]
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
 [1]
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Revenues:                      
Dividends from subsidaries                 $ (100,100)    
Net investment income earned $ 54,109 $ 52,443 $ 45,553 $ 43,231 $ 42,587 $ 40,446 $ 41,430 $ 37,419 195,336 $ 161,882 $ 130,754
Net realized losses                 (25,554) 6,359 (4,937)
Total revenues 643,004 664,471 651,916 626,689 633,737 621,293 614,485 600,469 2,586,080 2,469,984 2,284,270
Expenses:                      
Interest expense                 24,419 24,354 22,771
Total expenses                 2,374,359 2,208,016 2,064,315
Federal income tax (benefit) expense:                      
Current                 35,012 62,184 48,581
Deferred                 (2,230) 30,958 12,879
Total federal income tax expense                 32,782 93,142 61,460
Net income $ 45,760 $ 55,435 $ 58,819 $ 18,925 $ 30,242 $ 46,718 $ 41,426 $ 50,440 178,939 168,826 158,495
Parent Company [Member]                      
Revenues:                      
Dividends from subsidaries                 100,060 80,096 61,014
Net investment income earned                 3,425 2,044 1,259
Net realized losses                 (1,567) (15) (220)
Total revenues                 101,918 82,125 62,053
Expenses:                      
Interest expense                 24,652 24,721 24,030
Other expenses                 25,446 36,251 35,020
Total expenses                 50,098 60,972 59,050
Income before federal income tax                 51,820 21,153 3,003
Federal income tax (benefit) expense:                      
Current                 (14,173) (22,187) (17,924)
Deferred                 3,141 6,311 (2,143)
Total federal income tax expense                 (11,032) (15,876) (20,067)
Net income before equity in undistributed income of subsidiaries                 62,852 37,029 23,070
Equity In Undistributed Income Of Continuing Subsidiaries, Net Of Tax                 116,087 131,797 135,425
Net income                 $ 178,939 $ 168,826 $ 158,495
[1] Results for the fourth quarter of 2017 include the impact of the $20.2 million write off of deferred tax assets required with the implementation of Tax Reform. See Note 13. "Federal Income Taxes" above for additional information.