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Income Taxes (Deferred Tax Assets And Liabilities) (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Deferred tax assets:    
20% of net unearned premiums $ 47,110 $ 77,104
Discounting of loss reserves and salvage and subrogation recoverable for tax purposes 6,451 9,864
Write-down of impaired investments 387 726
Tax credit carryforwards 230 47,238
Expense accruals 6,192 11,090
Other deferred tax assets 3,174 8,828
Total gross deferred tax assets 63,544 154,850
Deferred tax liabilities:    
Deferred policy acquisition costs (41,612) (70,289)
Tax liability on net unrealized gain on securities carried at fair value (27,574) (15,612)
Tax depreciation in excess of book depreciation (5,686) (10,446)
Undistributed earnings of insurance subsidiaries (3,907) (3,985)
Tax amortization in excess of book amortization (2,280) (3,030)
Other deferred tax liabilities (5,417) (6,211)
Total gross deferred tax liabilities (86,476) (109,573)
Net deferred tax liabilities $ (22,932)  
Net deferred tax assets   $ 45,277