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Income Taxes (Tables) | 12 Months Ended
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Dec. 31, 2017
Income Tax Disclosure [Abstract] |
Provision (Benefit) for Income Taxes | The provision (benefit) for income taxes for the years ended December 31, 2017, 2016 and 2015, consisted of the following (in thousands):
|  | Years Ended December 31,
|  | 2017 |  | 2016 |  | 2015
Current: |  |  |  |  |  |
Federal |  | $ | 133,097 |  |  | $ | 156,937 |  |  | $ | 181,640 |
State |  | 24,944 |  |  | 34,927 |  |  | 36,281 |
Foreign |  | 27,079 |  |  | 20,725 |  |  | 13,892 |
Deferred: |  |  |  |  |  |
Federal and state |  | 41,717 |  |  | (3,785 | ) |  | (8,398 | )
Foreign |  | 95 |  |  | 1,917 |  |  | (181 | )
|  | $ | 226,932 |  |  | $ | 210,721 |  |  | $ | 223,234 |
Income Before Provision for Income Taxes | Income before the provision for income taxes for the years ended December 31, 2017, 2016 and 2015, consisted of the following (in thousands):
|  | Years Ended December 31,
|  | 2017 |  | 2016 |  | 2015
Domestic |  | $ | 445,418 |  |  | $ | 494,890 |  |  | $ | 528,916 |
Foreign |  | 72,098 |  |  | 59,220 |  |  | 52,114 |
|  | $ | 517,516 |  |  | $ | 554,110 |  |  | $ | 581,030 |
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,
|  | 2017 |  | 2016 |  | 2015
Federal U.S. income tax rate |  | 35.0 | % |  | 35.0 | % |  | 35.0 | %
State income taxes, net of federal tax benefit |  | 3.7 |  |  | 4.2 |  |  | 4.2 |
Non-deductible expenses |  | 0.4 |  |  | 0.5 |  |  | 0.5 |
Non-U.S. income taxed at different rates, net of foreign tax credits |  | — |  |  | (0.6 | ) |  | 0.1 |
Federal tax credits |  | (1.3 | ) |  | (0.8 | ) |  | (0.6 | )
Tax impact of uncertain tax positions |  | 0.2 |  |  | — |  |  | (0.2 | )
Valuation allowance release, net |  | — |  |  | (0.1 | ) |  | (0.5 | )
Tax effects of TCJA |  | 6.5 |  |  | — |  |  | — |
Other, net |  | (0.6 | ) |  | (0.2 | ) |  | (0.1 | )
Effective tax rate |  | 43.9 | % |  | 38.0 | % |  | 38.4 | %
Deferred Portion of Tax Provision (Benefit) | The deferred portion of the tax provision (benefit) consisted of the following (in thousands):
|  | Years Ended December 31,
|  | 2017 |  | 2016 |  | 2015
Amortization of franchise rights |  | $ | 495 |  |  | $ | 500 |  |  | $ | 514 |
Amortization of other intangibles |  | 1,193 |  |  | 1,221 |  |  | 1,590 |
Accrued expenses, deducted for tax when paid |  | 15,213 |  |  | (6,889 | ) |  | (17,664 | )
Capitalized costs for books, deducted for tax |  | (5,790 | ) |  | 5,901 |  |  | 5,315 |
Depreciation |  | (4,079 | ) |  | (2,405 | ) |  | (5,932 | )
Federal impact of unrecognized tax benefits |  | 39 |  |  | 75 |  |  | 1,058 |
Foreign tax credit carryforwards |  | — |  |  | — |  |  | 3,636 |
Tax effects of TCJA |  | 34,633 |  |  | — |  |  | — |
Other, net |  | 108 |  |  | (271 | ) |  | 2,904 |
|  | $ | 41,812 |  |  | $ | (1,868 | ) |  | $ | (8,579 | )
Components of Deferred Income Tax Amounts | The components of the deferred income tax amounts at December 31, 2017 and 2016, were as follows (in thousands):
|  | December 31,
|  | 2017 |  | 2016
Deferred Income Tax Assets |  |  |  |
Provision for bad debts |  | $ | 6,794 |  |  | $ | 10,510 |
Deferred compensation and other benefit obligations |  | 68,101 |  |  | 112,811 |
Workers’ compensation |  | 3,127 |  |  | 5,634 |
Stock-based compensation |  | 8,614 |  |  | 16,772 |
Credits and net operating loss carryforwards |  | 30,087 |  |  | 30,534 |
Other |  | 13,343 |  |  | 18,116 |
Total deferred income tax assets |  | 130,066 |  |  | 194,377 |
Deferred Income Tax Liabilities |  |  |  |
Amortization of intangible assets |  | (20,220 | ) |  | (28,681 | )
Property and equipment basis differences |  | (4,421 | ) |  | (16,640 | )
Other |  | (10,847 | ) |  | (11,658 | )
Total deferred income tax liabilities |  | (35,488 | ) |  | (56,979 | )
Valuation allowance |  | (20,178 | ) |  | (18,907 | )
Total deferred income tax assets, net |  | $ | 74,400 |  |  | $ | 118,491 |
Reconciliation of Total Amounts of Gross Unrecognized Tax Benefits | The following table reconciles the total amounts of gross unrecognized tax benefits from January 1, 2015 to December 31, 2017 (in thousands):
|  | December 31,
|  | 2017 |  | 2016 |  | 2015
Balance at beginning of period |  | $ | 731 |  |  | $ | 814 |  |  | $ | 4,573 |
Gross increases—tax positions in prior years |  | 1,503 |  |  | 92 |  |  | — |
Gross decreases—tax positions in prior years |  | (257 | ) |  | — |  |  | (1,807 | )
Gross increases—tax positions in current year |  | 956 |  |  | 114 |  |  | 120 |
Settlements |  | (40 | ) |  | — |  |  | (520 | )
Lapse of statute of limitations |  | (7 | ) |  | (289 | ) |  | (1,552 | )
Balance at end of period |  | $ | 2,886 |  |  | $ | 731 |  |  | $ | 814 |

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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://www.xbrl.org/2003/role/presentationRef -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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