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Income Taxes (Details 1) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Deferred tax assets    
Unearned premium reserve reduction $ 18,253 $ 17,402
Compensation accruals 15,893 13,737
Impaired securities 8,214 7,635
Other comprehensive income - net funded status of pension and other postretirement benefit obligations 6,387 6,375
Discounting of unpaid claims and claim expense tax reserves 2,463 3,213
Postretirement benefits other than pensions 578 664
Other, net 0 1,189
Total gross deferred tax assets 51,788 50,215
Deferred tax liabilities    
Other comprehensive income - net unrealized gains on fixed maturities and equity securities 112,311 112,934
Deferred policy acquisition costs 91,028 85,341
Life insurance future policy benefit reserve 33,145 30,177
Investment related adjustments 15,762 18,709
Intangible assets 4,262 4,262
Other, net 979 0
Total gross deferred tax liabilities 257,487 251,423
Net deferred tax liability $ 205,699 $ 201,208