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Income Taxes (Deferred Tax Assets and Liabilities) (Details) - USD ($) $ in Thousands | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
--- | --- | --- | --- | ---
Deferred tax assets |  |  |  |
Accrued employee benefits and compensation | $ 9,284 | $ 9,168 |  |
Postretirement benefit obligations | 5,434 | 7,866 |  |
Tax loss and credit carryforwards | 9,318 | 16,533 |  |
Reserves and accruals | 5,075 | 4,230 |  |
Depreciation and amortization | 0 | 17,862 |  |
Other | 3,474 | 2,550 |  |
Total deferred tax assets | 32,585 | 58,209 |  |
Less deferred tax asset valuation allowance | (6,202) | (7,691) | $ (7,302) | $ (7,992)
Total deferred tax assets, net of valuation allowance | 26,383 | 50,518 |  |
Deferred tax liabilities |  |  |  |
Depreciation and amortization | 17,492 | 14,303 |  |
Other | 187 | 344 |  |
Total deferred tax liabilities | 17,679 | 14,647 |  |
Net deferred tax asset | $ 8,704 | $ 35,871 |  |

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