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Income Taxes (Deferred Tax Assets and Liabilities) (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | --- | --- | ---
Deferred tax assets |  |  |  |
Accrued employee benefits and compensation | $ 6,199 | $ 5,730 |  |
Tax loss and credit carryforwards | 17,644 | 17,761 |  |
Reserves and accruals | 6,581 | 5,996 |  |
Operating leases | 665 | 904 |  |
Capitalized research and development | 14,167 | 11,343 |  |
Other | 1,824 | 2,210 |  |
Total deferred tax assets | 47,080 | 43,944 |  |
Less deferred tax asset valuation allowance | (9,250) | (14,625) | $ (16,889) | $ (8,754)
Total deferred tax assets, net of valuation allowance | 37,830 | 29,319 |  |
Deferred tax liabilities |  |  |  |
Depreciation and amortization | 10,282 | 15,368 |  |
Postretirement benefit obligations | 2,001 | 1,719 |  |
Unremitted earnings | 2,426 | 1,624 |  |
Operating leases | 714 | 908 |  |
Other | 2,115 | 1,803 |  |
Total deferred tax liabilities | 17,538 | 21,422 |  |
Net deferred tax asset (liability) | $ 20,292 | $ 7,897 |  |

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