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Income Taxes (Details 1) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Deferred tax assets    
Unearned premium reserve reduction $ 14,952 $ 14,336
Compensation accruals 13,592 8,304
Other comprehensive income net funded status of pension and other postretirement benefit obligations 8,352 8,798
Discounting of unpaid claims and claim expenses tax reserves 4,825 5,388
Postretirement benefits other than pensions 2,333 2,743
Impaired securities 1,268 5,410
Unutilized net operating loss carryforward   8,394
Total gross deferred tax assets 45,322 53,373
Deferred tax liabilities    
Other comprehensive income - net unrealized gains on fixed maturities and equity securities 228,159 155,941
Deferred policy acquisition costs 62,411 66,820
Life insurance future policy benefit reserve 18,620 15,704
Investment related adjustments 15,375 13,984
Intangible assets 4,262 4,262
Other, net 3,221 1,083
Total gross deferred tax liabilities 332,048 257,794
Net deferred tax liability $ 286,726 $ 204,421