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Income Taxes (Tables) | 12 Months Ended
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Dec. 31, 2019
Income Tax Disclosure [Abstract] |
Provision (Benefit) for Income Taxes | The provision (benefit) for income taxes for the years ended December 31, 2019, 2018 and 2017, consisted of the following (in thousands):
|  | Years Ended December 31, |  |  |  |
|  | 2019 |  | 2018 |  | 2017
Current: |  |  |  |  |  |
Federal |  | $ | 107,699 |  |  | $ | 99,830 |  |  | $ | 133,097 |
State |  | 39,028 |  |  | 38,356 |  |  | 24,944 |
Foreign |  | 33,227 |  |  | 35,007 |  |  | 27,079 |
Deferred: |  |  |  |  |  |
Federal and state |  | (9,959) |  |  | $ | (15,849) |  |  | $ | 41,717 |
Foreign |  | 1,087 |  |  | (30) |  |  | 95 |
|  | $ | 171,082 |  |  | $ | 157,314 |  |  | $ | 226,932 |
Income Before Provision for Income Taxes | Income before the provision for income taxes for the years ended December 31, 2019, 2018 and 2017, consisted of the following (in thousands):
|  | Years Ended December 31, |  |  |  |
|  | 2019 |  | 2018 |  | 2017
Domestic |  | $ | 545,695 |  |  | $ | 485,489 |  |  | $ | 445,418 |
Foreign |  | 79,820 |  |  | 106,113 |  |  | 72,098 |
|  | $ | 625,515 |  |  | $ | 591,602 |  |  | $ | 517,516 |
Difference of Income Taxes from Statutory Federal Income Tax Rates | The income taxes shown above varied from the statutory federal income tax rates for these periods as follows:
|  | Years Ended December 31, |  |  |  |
|  | 2019 |  | 2018 |  | 2017
Federal U.S. income tax rate |  | 21.0 | % |  | 21.0 | % |  | 35.0 | %
State income taxes, net of federal tax benefit |  | 4.9 |  |  | 4.7 |  |  | 3.7 |
Permanent book/tax differences |  | 1.1 |  |  | 0.6 |  |  | 0.4 |
Non-U.S. income taxed at different rates, net of foreign tax credits |  | 2.1 |  |  | 2.0 |  |  | — |
Federal tax credits |  | (1.4) |  |  | (1.7) |  |  | (1.3) |
Tax impact of uncertain tax positions |  | 0.2 |  |  | 0.8 |  |  | 0.2 |
Tax effects of TCJA |  | — |  |  | 0.4 |  |  | 6.5 |
Other, net |  | (0.5) |  |  | (1.2) |  |  | (0.6) |
Effective tax rate |  | 27.4 | % |  | 26.6 | % |  | 43.9 | %
Deferred Portion of Tax Provision (Benefit) | The deferred portion of the tax (benefit) provision consisted of the following (in thousands):
|  | Years Ended December 31, |  |  |  |
|  | 2019 |  | 2018 |  | 2017
Accrued expenses, deducted for tax when paid |  | $ | (17,797) |  |  | $ | (21,884) |  |  | $ | 15,213 |
Capitalized costs for books, deducted for tax |  | 3,246 |  |  | (4,832) |  |  | (5,790) |
Depreciation |  | 3,526 |  |  | 10,071 |  |  | (4,079) |
Tax effects of TCJA |  | — |  |  | — |  |  | 34,633 |
Other, net |  | 2,153 |  |  | 766 |  |  | 1,835 |
|  | $ | (8,872) |  |  | $ | (15,879) |  |  | $ | 41,812 |
Components of Deferred Income Tax Amounts | The components of the deferred income tax amounts at December 31, 2019 and 2018, were as follows (in thousands):
|  | December 31, |  |
|  | 2019 |  | 2018
Deferred Income Tax Assets |  |  |  |
Deferred compensation and other benefit obligations |  | $ | 105,096 |  |  | $ | 87,513 |
Credits and net operating loss carryforwards |  | 25,130 |  |  | 31,169 |
Stock-based compensation |  | 7,805 |  |  | 9,535 |
Provision for bad debts |  | 7,944 |  |  | 7,891 |
Workers’ compensation |  | 3,929 |  |  | 3,580 |
Operating lease liabilities |  | 51,932 |  |  | — |
Other |  | 10,256 |  |  | 14,959 |
Total deferred income tax assets |  | 212,092 |  |  | 154,647 |
Deferred Income Tax Liabilities |  |  |  |
Amortization of intangible assets |  | (22,009) |  |  | (21,210) |
Property and equipment basis differences |  | (16,981) |  |  | (9,761) |
Right-of-use assets |  | (44,448) |  |  | — |
Other |  | (7,278) |  |  | (10,319) |
Total deferred income tax liabilities |  | (90,716) |  |  | (41,290) |
Valuation allowance |  | (21,618) |  |  | (23,072) |
Total deferred income tax assets, net |  | $ | 99,758 |  |  | $ | 90,285 |
Reconciliation of Total Amounts of Gross Unrecognized Tax Benefits | The following table reconciles the total amounts of gross unrecognized tax benefits from January 1, 2017 to December 31, 2019 (in thousands):
|  | December 31, |  |  |  |
|  | 2019 |  | 2018 |  | 2017
Balance at beginning of period |  | $ | 8,418 |  |  | $ | 2,886 |  |  | $ | 731 |
Gross increases—tax positions in prior years |  | — |  |  | 3,259 |  |  | 1,503 |
Gross decreases—tax positions in prior years |  | (760) |  |  | (8) |  |  | (257) |
Gross increases—tax positions in current year |  | 1,703 |  |  | 2,284 |  |  | 956 |
Settlements |  | (4) |  |  | — |  |  | (40) |
Lapse of statute of limitations |  | (3) |  |  | (3) |  |  | (7) |
Balance at end of period |  | $ | 9,354 |  |  | $ | 8,418 |  |  | $ | 2,886 |

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