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Federal Income Taxes (Deferred Tax Assets and Liabilities) (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Net loss reserve discounting $ 74,436 $ 84,502  
Net unearned premiums 72,057 66,470  
Employee benefits 30,432 33,721  
Long-term incentive compensation plans 15,551 13,625  
Temporary investment write-downs 5,419 3,939  
Net operating loss 1,454 2,136  
Alternative minimum tax credits 0 7,400  
Other 8,132 9,237  
Total deferred tax assets 207,481 221,030  
Deferred policy acquisition costs 72,481 63,242  
Unrealized gains on investment securities 24,228 43,289  
Other investment-related items, net 5,566 5,088  
Accelerated depreciation and amortization 12,510 10,962  
Total deferred tax liabilities 114,785 122,581  
Net deferred federal income tax asset 92,696 98,449  
Tax benefits related to compensation expense deductions for share-based compensation awards $ 22,000 $ 20,200 $ 19,200