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Income Taxes - Deferred Tax Assets (Liabilities) (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | --- | --- | ---
Deferred Tax Assets |  |  |  |
Allowance for expected credit losses | $ 1,213 | $ 1,404 |  |
Accrued paid time off | 3,039 | 2,801 |  |
Foreign net operating loss carry forward |  | 229 |  |
State net operating loss carry forward | 500 | 502 |  |
Stock based compensation | 5,523 | 1,586 |  |
Deferred compensation | 5,765 | 4,692 |  |
Foreign tax credits | 8,035 | 7,236 |  |
Federal and state tax credits | 686 | 384 |  |
Foreign exchange | 3,591 | 4,532 |  |
Foreign deferred | 441 | 875 |  |
Accrued bonus | 5,830 | 5,696 |  |
Capital loss | 1,054 |  |  |
Facilities impairment | 3,092 | 2,650 |  |
Capitalized research expenses | 47,019 | 990 |  |
Accrued liabilities and other | 2,682 | 5,523 |  |
Lease liabilities | 58,538 | 56,695 |  |
Deferred Tax Assets, gross, before valuation allowance | 147,008 | 95,795 |  |
Less: Valuation Allowance | (9,021) | (7,607) | $ (7,048) | $ (6,839)
Total Deferred Tax Assets | 137,987 | 88,188 |  |
Deferred Tax Liabilities |  |  |  |
Retention |  | (407) |  |
Prepaid expenses |  | (366) |  |
Payroll taxes | (725) | (697) |  |
Unbilled revenue | (284) | (409) |  |
Depreciation | (2,128) | (270) |  |
Amortization | (107,201) | (99,045) |  |
Deferred gain and other | (2,202) | (2,561) |  |
Lease assets - Right-of-Use | (51,622) | (52,471) |  |
Total Deferred Tax Liabilities | (164,162) | (156,226) |  |
Total Net Deferred Tax Liability | $ (26,175) | $ (68,038) |  |

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