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Federal Income Taxes (Deferred Tax Assets and Liabilities) (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Net loss reserve discounting $ 70,065 $ 74,436  
Net unearned premiums 78,201 72,057  
Employee benefits 17,881 30,432  
Long-term incentive compensation plans 17,750 15,551  
Temporary investment write-downs 2,475 5,419  
Other investment-related items, net 1,484 0  
Net operating loss 771 1,454  
Other 8,344 8,132  
Total deferred tax assets 196,971 207,481  
Deferred policy acquisition costs 75,310 72,481  
Unrealized gains on investment securities 22,681 24,228  
Other investment-related items, net 0 5,566  
Accelerated depreciation and amortization 14,140 12,510  
Total deferred tax liabilities 112,131 114,785  
Net deferred federal income tax asset 84,840 92,696  
Tax benefits related to compensation expense deductions for share-based compensation awards $ 23,800 $ 22,000 $ 20,200