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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, 2018
Dec. 31, 2017
Dec. 31, 2016
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 125,000 $ 35,000  
Provisional Increase to Deferred Tax Asset 26,300 7,500  
Provisional Increase to Deferred Tax Asset Per Year 3,300    
Tax at statutory rate (21% in 2018 and 35% in 2017 and 2016) 44,461 91,689 $ 76,984
Tax-advantaged interest (5,518) (11,510) (12,126)
Dividends received deduction (647) (1,961) (1,114)
Federal Income Tax Expense Benefit Related to Executive Compensation 2,279 0 121
Share-based compensation expense income tax benefit (3,093) (4,281) 0
Tax Reform Deferred Tax Asset Impact 0 20,205 0
Other (4,700) (1,000) (2,405)
Total federal income tax expense $ 32,782 $ 93,142 $ 61,460