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Income Taxes - Significant Components of Company's Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Deferred Tax Assets: |  |
Asset Reserves | $ 18,189 | $ 17,071
Deferred Compensation | 7,564 | 6,427
State Investment and Research and Development Tax Credit Carryforwards, Net of Federal Tax | 866 | 854
Customer Advanced Payments and Deferred Revenue | 2,216 | 3,472
Net Operating Loss Carryforwards and Other | 11,244 | 8,212
Goodwill and Intangible Assets | 2,069 | 0
ASC 606 Revenue Recognition | 2,311 | 2,612
Lease Liabilities | 5,545 | 7,466
Other | 2,300 | 3,170
Total Gross Deferred Tax Assets | 52,304 | 49,284
Valuation Allowance for Foreign Tax Credit, State Deferred Tax Assets and Tax Credit Carryforwards, Net of Federal Tax | (37,168) | (13,303)
Deferred Tax Assets | 15,136 | 35,981
Deferred Tax Liabilities: |  |
Depreciation | 10,166 | 10,060
Goodwill and Intangible Assets | 0 | 4,683
ASC 606 Revenue Recognition - Section 481(a) Adjustment | 928 | 496
Lease Assets | 4,506 | 6,377
Other | 1,186 | 751
Deferred Tax Liabilities | 16,786 | 22,367
Net Deferred Tax (Liabilities) Assets | $ (1,650) |
Net Deferred Tax (Liabilities) Assets |  | $ 13,614

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