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Income Taxes - Deferred Tax Assets (Liabilities) (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | --- | --- | ---
Deferred Tax Assets |  |  |  |
Allowance for bad debt | $ 1,687 | $ 888 |  |
Accrued paid time off | 2,423 | 1,671 |  |
Foreign net operating loss (NOL) carry forward | 957 | 866 |  |
State net operating loss (NOL) carry forward | 714 | 714 |  |
Stock option compensation | 2,308 | 2,666 |  |
Deferred rent | 3,091 | 3,129 |  |
Deferred compensation | 4,598 | 3,902 |  |
Foreign tax credits | 5,882 | 4,508 |  |
Foreign exchange | 5,370 | 3,579 |  |
Foreign deferred | 650 | 200 |  |
Accrued bonus | 4,126 | 884 |  |
Accrued liabilities and other | 5,701 | 4,434 |  |
Deferred Tax Assets, gross, before valuation allowance | 39,615 | 29,467 |  |
Less: Valuation Allowance | (6,839) | (5,374) | $ (5,112) | $ (1,636)
Total Deferred Tax Assets | 32,776 | 24,093 |  |
Deferred Tax Liabilities |  |  |  |
Retention | (1,003) | (1,395) |  |
Prepaid expenses | (1,089) | (1,451) |  |
Payroll taxes | (489) | (593) |  |
Unbilled revenue | (1,451) | (2,691) |  |
Depreciation | (1,731) | (3,112) |  |
Amortization | (60,392) | (52,076) |  |
Deferred gain and other | (951) | (396) |  |
Total Deferred Tax Liabilities | (67,106) | (61,714) |  |
Total Net Deferred Tax Liability | (34,330) | (37,621) |  |
State and Local Jurisdiction |  |  |  |
Deferred Tax Assets |  |  |  |
Tax credits | $ 2,108 | $ 2,026 |  |

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