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Federal Income Taxes (Deferred Tax Assets and Liabilities) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Change in Net Deferred Federal Income Tax Assets $ 52,900    
Net loss reserve discounting 38,771 $ 70,065  
Net unearned premiums 50,267 78,201  
Employee benefits 8,606 17,881  
Long-term incentive compensation plans 12,221 17,750  
Temporary investment write-downs 1,044 2,475  
Other investment-related items, net 0 1,484  
Net operating loss 54 771  
Other 5,784 8,344  
Total deferred tax assets 116,747 196,971  
Deferred policy acquisition costs 47,484 75,310  
Unrealized gains on investment securities 26,183 22,681  
Other investment-related items, net 2,500 0  
Accelerated depreciation and amortization 8,590 14,140  
Total deferred tax liabilities 84,757 112,131  
Tax benefits related to compensation expense deductions for share-based compensation awards 23,800 $ 23,800 $ 22,000
Investments [Member]      
Change in Net Deferred Federal Income Tax Assets $ 21,400