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Income Taxes (Deferred Tax Assets And Liabilities) (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Deferred tax assets: |  |
20% of net unearned premiums | $ 77,104 | $ 75,406
Discounting of loss reserves and salvage and subrogation recoverable for tax purposes | 9,864 | 9,518
Write-down of impaired investments | 726 | 857
Tax credit carryforward | 47,238 | 36,349
Expense accruals | 11,090 | 11,264
Other deferred tax assets | 8,828 | 9,596
Total gross deferred tax assets | 154,850 | 142,990
Deferred tax liabilities: |  |
Deferred policy acquisition costs | (70,289) | (70,617)
Tax liability on net unrealized gain on securities carried at fair value | (15,612) | (23,095)
Tax depreciation in excess of book depreciation | (10,446) | (10,742)
Undistributed earnings of insurance subsidiaries | (3,985) | (4,022)
Tax amortization in excess of book amortization | (3,030) | (2,514)
Other deferred tax liabilities | (6,211) | (8,769)
Total gross deferred tax liabilities | (109,573) | (119,759)
Net deferred tax assets | $ 45,277 | $ 23,231

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