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Income Taxes (Deferred Tax Assets and Liabilities) (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | --- | ---
Deferred tax assets |  |  |  |
Accrued employee benefits and compensation | $ 10,647 | $ 6,199 |  |
Net operating loss carryforwards | 3,785 | 2,563 |  |
Tax credit carryforwards | 13,170 | 15,081 |  |
Reserves and accruals | 5,145 | 6,581 |  |
Operating leases | 4,191 | 665 |  |
Capitalized research and development | 16,622 | 14,167 |  |
Other | 5,299 | 1,824 |  |
Total deferred tax assets | 58,859 | 47,080 |  |
Less deferred tax asset valuation allowance | (9,775) | (9,250) | $ (14,625) | $ (16,889)
Total deferred tax assets, net of valuation allowance | 49,084 | 37,830 |  |
Deferred tax liabilities |  |  |  |
Depreciation and amortization | 32,669 | 10,282 |  |
Postretirement benefit obligations | 2,071 | 2,001 |  |
Unremitted earnings | 2,335 | 2,426 |  |
Operating leases | 4,422 | 714 |  |
Other | 4,367 | 2,115 |  |
Total deferred tax liabilities | 45,864 | 17,538 |  |
Net deferred tax asset (liability) | $ 3,220 | $ 20,292 |  |

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