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Income Taxes - Deferred Tax Assets (Liabilities) (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | --- | --- | ---
Deferred Tax Assets |  |  |  |
Allowance for bad debt | $ 1,321 | $ 1,003 |  |
Accrued paid time off | 1,437 | 1,624 |  |
Foreign net operating loss (NOL) carry forward | 1,144 | 1,301 |  |
State net operating loss (NOL) carry forward | 507 | 507 |  |
Stock option compensation | 2,332 | 2,726 |  |
Deferred rent | 3,127 | 3,355 |  |
Deferred compensation | 3,348 | 3,238 |  |
Foreign tax credits | 3,968 | 505 |  |
Foreign exchange | 2,430 | 2,051 |  |
Foreign deferred | 342 |  |  |
Accrued liabilities and other | 4,079 | 3,272 |  |
Deferred Tax Assets, gross, before valuation allowance | 26,076 | 21,367 |  |
Less: Valuation Allowance | (5,112) | (1,636) | $ (1,131) | $ (933)
Total Deferred Tax Assets | 20,964 | 19,731 |  |
Deferred Tax Liabilities |  |  |  |
Retention | (1,239) | (1,375) |  |
Prepaid expenses | (1,301) | (1,045) |  |
Payroll taxes | (495) | (489) |  |
Unbilled revenue | (4,135) | (5,407) |  |
Depreciation | (7,306) | (4,773) |  |
Amortization | (46,051) | (39,993) |  |
Deferred gain and other | (602) |  |  |
Total Deferred Tax Liabilities | (61,129) | (53,082) |  |
Total Net Deferred Tax Liability | (40,165) | (33,351) |  |
State and Local Jurisdiction |  |  |  |
Deferred Tax Assets |  |  |  |
Tax credits | $ 2,041 | $ 1,785 |  |

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