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Income Taxes (Tables) | 12 Months Ended
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Dec. 31, 2019
Income Tax Disclosure [Abstract] |
Summary of Components of Deferred Tax Assets and Liabilities | The table below summarizes significant components of deferred tax assets and liabilities.
| Year Ended December 31,
| 2019 |  | 2018
Deferred tax assets |  |  |
Allowance for doubtful accounts | $ | 13,041 |  |  | $ | 11,792 |
Accrued vacation and bonus | 27,438 |  |  | 23,545 |
Deferred rent | — |  |  | 9,016 |
Share-based compensation | 12,647 |  |  | 11,837 |
Notes receivable from employees | 12,187 |  |  | 12,993 |
State net operating loss carryforward | 2,066 |  |  | 3,510 |
Foreign net operating loss carryforward | 9,388 |  |  | 9,857 |
Federal tax credit and capital loss carryforward | 7,336 |  |  | 9,470 |
Deferred compensation | 2,117 |  |  | 1,801 |
Operating lease assets | 43,397 |  |  | — |
Employee benefits obligations | 1,191 |  |  | 943 |
Other, net | 1,898 |  |  | 186 |
Total deferred tax assets | 132,706 |  |  | 94,950 |
Deferred tax liabilities |  |  |
Revenue recognition | (6,732 | ) |  | (5,087 | )
Operating lease liabilities | (29,671 | ) |  | — |
Property and equipment, net | (3,797 | ) |  | (6,652 | )
Equity debt discount | (8,890 | ) |  | (11,014 | )
Goodwill and other intangible assets | (209,250 | ) |  | (199,964 | )
Total deferred tax liabilities | (258,340 | ) |  | (222,717 | )
Foreign withholding tax | (1,195 | ) |  | (413 | )
Valuation allowance | (19,865 | ) |  | (21,929 | )
Net deferred tax liabilities | $ | (146,694 | ) |  | $ | (150,109 | )
Summary of Components of Income Before Income Tax Provision from Continuing Operations | The table below summarizes the components of income before income tax provision (benefit) from continuing operations.
| Year Ended December 31,
| 2019 |  | 2018 |  | 2017
Domestic | $ | 150,860 |  |  | $ | 96,543 |  |  | $ | 30,013 |
Foreign | 137,590 |  |  | 111,249 |  |  | 57,092 |
Total | $ | 288,450 |  |  | $ | 207,792 |  |  | $ | 87,105 |
Summary of Components of Income Tax Provision from Continuing Operations | The table below summarizes the components of income tax provision (benefit) from continuing operations.
| Year Ended December 31,
| 2019 |  | 2018 |  | 2017
Current |  |  |  |  |
Federal | $ | 30,651 |  |  | $ | 10,847 |  |  | $ | 15,164 |
State | 7,702 |  |  | 4,447 |  |  | 742 |
Foreign | 37,083 |  |  | 21,056 |  |  | 14,816 |
| 75,436 |  |  | 36,350 |  |  | 30,722 |
Deferred |  |  |  |  |
Federal | (1,767 | ) |  | 14,538 |  |  | (47,820 | )
State | 785 |  |  | 503 |  |  | (152 | )
Foreign | (2,730 | ) |  | 5,790 |  |  | (3,607 | )
| (3,712 | ) |  | 20,831 |  |  | (51,579 | )
Income tax provision (benefit) | $ | 71,724 |  |  | $ | 57,181 |  |  | $ | (20,857 | )
Summary of Income Tax Provision from Continuing Operations Resulted in Effective Tax Rates | Our income tax provision (benefit) from continuing operations resulted in effective tax rates that varied from the statutory federal income tax rate as summarized below.
| Year Ended December 31,
| 2019 |  | 2018 |  | 2017
Income tax expense at federal statutory rate | $ | 60,575 |  |  | $ | 43,636 |  |  | $ | 30,487 |
State income taxes, net of federal benefit | 8,430 |  |  | 4,950 |  |  | 781 |
Detriment (benefit) from foreign tax rates | 3,425 |  |  | 3,655 |  |  | (8,500 | )
Valuation allowance on foreign net operating loss carryforward | 260 |  |  | (450 | ) |  | 253 |
Other expenses not deductible for tax purposes | 4,362 |  |  | 3,543 |  |  | 2,466 |
Adjustment to reserve for uncertain tax positions | 2,504 |  |  | (132 | ) |  | 456 |
Impact of 2017 U.S. tax reform — deferred tax | — |  |  | (706 | ) |  | (63,525 | )
Impact of 2017 U.S. tax reform — Transition Tax | (1,088 | ) |  | 50 |  |  | 18,655 |
Sale of Ringtail business | (2,097 | ) |  | 3,798 |  |  | — |
Equity-based compensation | (4,447 | ) |  | (1,371 | ) |  | 809 |
Other adjustments, net | (200 | ) |  | 208 |  |  | (2,739 | )
Income tax provision (benefit) | $ | 71,724 |  |  | $ | 57,181 |  |  | $ | (20,857 | )

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- Definition Tabular disclosure of the components of income tax expense attributable to continuing operations for each year presented including, but not limited to: current tax expense (benefit), deferred tax expense (benefit), investment tax credits, government grants, the benefits of operating loss carryforwards, tax expense that results from allocating certain tax benefits either directly to contributed capital or to reduce goodwill or other noncurrent intangible assets of an acquired entity, adjustments of a deferred tax liability or asset for enacted changes in tax laws or rates or a change in the tax status of the entity, and adjustments of the beginning-of-the-year balances of a valuation allowance because of a change in circumstances that causes a change in judgment about the realizability of the related deferred tax asset in future years. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32639-109319 + Details
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- Definition Tabular disclosure of the components of net deferred tax asset or liability recognized in an entity's statement of financial position, including the following: the total of all deferred tax liabilities, the total of all deferred tax assets, the total valuation allowance recognized for deferred tax assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319 + Details
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- Definition Tabular disclosure of the reconciliation using percentage or dollar amounts of the reported amount of income tax expense attributable to continuing operations for the year to the amount of income tax expense that would result from applying domestic federal statutory tax rates to pretax income from continuing operations. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 + Details
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