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Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Gross deferred tax assets |  |
Deferred compensation and accrued paid leave | $ 6,302 | $ 7,498
Operating lease liabilities | 6,984 | 7,009
Stock-based compensation | 605 | 678
Interest rate swaps | 400 | 367
Reserve for contract disallowance | 195 | 145
Capitalized inventory | 573 | 0
US operating and capital loss carryforward | 5,989 | 24
Tax credit carryforward | 1,412 | 1,547
Foreign country operating loss carryforward | 583 | 0
Gross deferred tax assets | 23,043 | 17,268
Valuation allowance | (7,926) | (1,165)
Total gross deferred tax assets | 15,117 | 16,103
Gross deferred tax liabilities |  |
Depreciation | (3,061) | (2,498)
Deferred revenues | (1,816) | (1,681)
Goodwill and intangible assets | (19,470) | (23,383)
Operating lease right-of-use assets | (5,384) | (5,323)
Capitalized inventory | 0 | (240)
Other | (283) | (823)
Total gross deferred tax liabilities | (30,014) | (33,948)
Net deferred tax liabilities | $ (14,897) | $ (17,845)

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