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Income Taxes - Deferred Tax Assets (Liabilities) (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | --- | ---
Deferred Tax Assets |  |  |  |
Allowance for expected credit losses | $ 1,825 | $ 1,687 |  |
Accrued paid time off | 2,504 | 2,423 |  |
Foreign net operating loss (NOL) carry forward | 91 | 957 |  |
State net operating loss (NOL) carry forward | 522 | 714 |  |
Stock option compensation | 1,680 | 2,308 |  |
Deferred rent | 2,566 | 3,091 |  |
Deferred compensation | 5,358 | 4,598 |  |
Foreign tax credits | 6,677 | 5,882 |  |
Foreign exchange | 4,014 | 5,370 |  |
Foreign deferred | 727 | 650 |  |
Accrued bonus | 5,303 | 4,126 |  |
Accrued liabilities and other | 6,660 | 5,701 |  |
Deferred Tax Assets, gross, before valuation allowance | 39,008 | 39,615 |  |
Less: Valuation Allowance | (7,048) | (6,839) | $ (5,374) | $ (5,112)
Total Deferred Tax Assets | 31,960 | 32,776 |  |
Deferred Tax Liabilities |  |  |  |
Retention | (637) | (1,003) |  |
Prepaid expenses | (726) | (1,089) |  |
Payroll taxes | (544) | (489) |  |
Unbilled revenue | (607) | (1,451) |  |
Depreciation | (1,920) | (1,731) |  |
Amortization | (68,194) | (60,392) |  |
Deferred gain and other | (1,245) | (951) |  |
Total Deferred Tax Liabilities | (73,873) | (67,106) |  |
Total Net Deferred Tax Liability | (41,913) | (34,330) |  |
State and Local Jurisdiction |  |  |  |
Deferred Tax Assets |  |  |  |
Tax credits | $ 1,081 | $ 2,108 |  |

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