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Federal Income Taxes (Reconciliation of Federal Income Tax on Income at the Corporate Rate to the Effective Tax Rate) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent 21.00% 35.00%  
Capital Loss Carrybacks   $ 3,800  
Decrease in Discounted Loss Reserve $ 109,500 125,000 $ 35,000
Provisional Increase to Deferred Tax Asset 23,000 26,300 7,500
Provisional Increase to Deferred Tax Asset Per Year 2,900 3,300  
Tax at statutory rate (21% in 2019 and 2018 and 35% in 2017) 70,642 44,461 91,689
Tax-advantaged interest (4,909) (5,518) (11,510)
Dividends received deduction (443) (647) (1,961)
Federal Income Tax Expense Benefit Related to Executive Compensation 2,985 2,279 0
Share-based compensation expense income tax benefit (3,253) (3,093) (4,281)
Tax Reform Deferred Tax Asset Impact 0 0 20,205
Other (255) (4,700) [1] (1,000)
Total federal income tax expense $ 64,767 $ 32,782 $ 93,142
[1] 2018 includes approximately $3.8 million of capital loss carry back items to prior tax years at the previous 35% statutory tax rate.