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Income Taxes (Tables) | 12 Months Ended
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Dec. 31, 2018
Income Tax Disclosure [Abstract] |
Income Before Income Taxes | The domestic and foreign components of income before provision for income taxes are as follows for the years ended December 31:
|  | 2018 |  |  | 2017 |  |  | 2016 |
Domestic |  | $ | 74,479 |  |  | $ | 69,347 |  |  | $ | 69,159 |
Foreign |  |  | 8,348 |  |  |  | 4,639 |  |  |  | 5,348 |
Income before income taxes |  | $ | 82,827 |  |  | $ | 73,986 |  |  | $ | 74,507 |
Income Tax Expense Components | Income tax expense consisted of the following for the years ended December 31:
|  | 2018 |  |  | 2017 |  |  | 2016 |
Current: |  |  |  |  |  |  |  |  |  |  |  |
Federal |  | $ | 9,700 |  |  | $ | 12,995 |  |  | $ | 12,979 |
State |  |  | 4,035 |  |  |  | 3,243 |  |  |  | 3,514 |
Foreign |  |  | 2,418 |  |  |  | 1,476 |  |  |  | 1,932 |
Total current |  |  | 16,153 |  |  |  | 17,714 |  |  |  | 18,425 |
Deferred: |  |  |  |  |  |  |  |  |  |  |  |
Federal |  |  | 4,072 |  |  |  | (9,425 | ) |  |  | 8,872 |
State |  |  | 1,452 |  |  |  | 2,749 |  |  |  | 1,222 |
Foreign |  |  | (250 | ) |  |  | 72 |  |  |  | (596 | )
Total deferred |  |  | 5,274 |  |  |  | (6,604 | ) |  |  | 9,498 |
Income tax expense |  | $ | 21,427 |  |  | $ | 11,110 |  |  | $ | 27,923 |
Deferred Tax Assets (Liabilities) | Deferred tax assets (liabilities) consisted of the following at December 31:
|  | 2018 |  |  | 2017 |
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 |
State tax credits |  |  | 2,041 |  |  |  | 1,785 |
Foreign exchange |  |  | 2,430 |  |  |  | 2,051 |
Foreign deferred |  |  | 342 |  |  |  | — |
Accrued liabilities and other |  |  | 4,079 |  |  |  | 3,272 |
|  |  | 26,076 |  |  |  | 21,367 |
Less: Valuation Allowance |  |  | (5,112 | ) |  |  | (1,636 | )
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 | )
Unrecognized Tax Benefit Reconciliation | The unrecognized tax benefit reconciliation, excluding penalty and interest, is as follows:
Unrecognized tax benefits at January 1, 2016 |  | $ | 400 |
Increase attributable to tax positions taken during a prior period |  |  | 925 |
Decrease attributable to lapse of statute of limitations |  |  | (140 | )
Unrecognized tax benefits at December 31, 2016 |  |  | 1,185 |
Decrease attributable to lapse of statute of limitations |  |  | (365 | )
Unrecognized tax benefits at December 31, 2017 |  |  | 820 |
Increase attributable to tax positions taken during the current period |  |  | 216 |
Decrease attributable to settlements with taxing authorities |  |  | (37 | )
Decrease attributable to lapse of statute of limitations |  |  | (783 | )
Unrecognized tax benefits at December 31, 2018 |  | $ | 216 |
Effective Income Tax Rate Reconciliation | The Company’s provision for income taxes differs from the federal statutory rate. The differences between the statutory rate and the Company’s provision are as follows:
|  | 2018 |  |  | 2017 |  |  | 2016 |
Taxes at statutory rate |  |  | 21.0 | % |  |  | 35.0 | % |  |  | 35.0 | %
State taxes, net of federal benefit |  |  | 5.2 | % |  |  | 4.4 | % |  |  | 3.9 | %
Foreign tax rate differential |  |  | 0.5 | % |  |  | (0.3 | )% |  |  | (0.1 | )%
Tax legislation |  |  | — |  |  |  | (22.6 | )% |  |  | — |
Other permanent differences |  |  | 1.8 | % |  |  | 0.7 | % |  |  | 0.8 | %
Prior year tax adjustments |  |  | 0.2 | % |  |  | (0.3 | )% |  |  | (1.0 | )%
Unrecognized tax benefits |  |  | (0.6 | )% |  |  | 0.1 | % |  |  | 1.0 | %
Valuation allowance |  |  | 1.3 | % |  |  | 0.7 | % |  |  | (0.3 | )%
Equity-based compensation |  |  | (3.0 | )% |  |  | (2.1 | )% |  |  | (1.0 | )%
Tax credits |  |  | (0.5 | )% |  |  | (0.6 | )% |  |  | (0.8 | )%
Taxes at effective rate |  |  | 25.9 | % |  |  | 15.0 | % |  |  | 37.5 | %

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