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Income Taxes (Tables) | 12 Months Ended
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Dec. 31, 2015
Income Tax Disclosure [Abstract] |
Provision (Benefit) for Income Taxes | The provision (benefit) for income taxes for the years ended December 31, 2015, 2014 and 2013, consisted of the following (in thousands):
|  | Years Ended December 31,
|  | 2015 |  | 2014 |  | 2013
Current: |  |  |  |  |  |
Federal |  | $ | 181,640 |  |  | $ | 146,633 |  |  | $ | 114,687 |
State |  | 36,281 |  |  | 33,054 |  |  | 27,358 |
Foreign |  | 13,892 |  |  | 15,377 |  |  | 16,598 |
Deferred: |  |  |  |  |  |
Federal and state |  | (8,398 | ) |  | (4,626 | ) |  | (7,759 | )
Foreign |  | (181 | ) |  | 983 |  |  | (5,500 | )
|  | $ | 223,234 |  |  | $ | 191,421 |  |  | $ | 145,384 |
Income Before Provision for Income Taxes | Income before the provision for income taxes for the years ended December 31, 2015, 2014 and 2013, consisted of the following (in thousands):
|  | Years Ended December 31,
|  | 2015 |  | 2014 |  | 2013
Domestic |  | $ | 520,263 |  |  | $ | 449,834 |  |  | $ | 357,382 |
Foreign |  | 60,767 |  |  | 47,515 |  |  | 40,197 |
|  | $ | 581,030 |  |  | $ | 497,349 |  |  | $ | 397,579 |
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,
|  | 2015 |  | 2014 |  | 2013
Federal U.S. income tax rate |  | 35.0 | % |  | 35.0 | % |  | 35.0 | %
State income taxes, net of federal tax benefit |  | 4.2 |  |  | 4.2 |  |  | 4.3 |
Non-deductible expenses |  | 0.5 |  |  | 0.6 |  |  | 0.7 |
Non-U.S. income taxed at different rates, net of foreign tax credits |  | 0.1 |  |  | (0.2 | ) |  | (1.0 | )
Federal tax credits |  | (0.6 | ) |  | (0.6 | ) |  | (1.3 | )
Tax impact of uncertain tax positions |  | (0.2 | ) |  | (0.1 | ) |  | 0.1 |
Valuation allowance release, net |  | (0.5 | ) |  | (0.3 | ) |  | (1.0 | )
Other, net |  | (0.1 | ) |  | (0.1 | ) |  | (0.2 | )
Effective tax rate |  | 38.4 | % |  | 38.5 | % |  | 36.6 | %
Deferred Portion of Tax Provision (Benefit) | The deferred portion of the tax provision (benefit) consisted of the following (in thousands):
|  | Years Ended December 31,
|  | 2015 |  | 2014 |  | 2013
Amortization of franchise rights |  | $ | 514 |  |  | $ | 514 |  |  | $ | 514 |
Amortization of other intangibles |  | 1,590 |  |  | 1,241 |  |  | 621 |
Accrued expenses, deducted for tax when paid |  | (17,664 | ) |  | (14,221 | ) |  | (11,190 | )
Capitalized costs for books, deducted for tax |  | 5,315 |  |  | 8,809 |  |  | 3,019 |
Depreciation |  | (5,932 | ) |  | (4,147 | ) |  | (2,597 | )
Federal impact of unrecognized tax benefits |  | 1,058 |  |  | 44 |  |  | (274 | )
Foreign tax credit carryforwards |  | 3,636 |  |  | (186 | ) |  | (3,449 | )
Other, net |  | 2,904 |  |  | 4,303 |  |  | 97 |
|  | $ | (8,579 | ) |  | $ | (3,643 | ) |  | $ | (13,259 | )
Deferred Income Tax Amounts Included on Consolidated Statements of Financial Position | The deferred income tax amounts included on the Consolidated Statements of Financial Position are composed of the following (in thousands):
|  | December 31,
|  | 2015 |  | 2014
Current deferred income tax assets, net |  | $ | 145,684 |  |  | $ | 133,151 |
Long-term deferred income tax liabilities, net |  | (29,139 | ) |  | (26,807 | )
|  | $ | 116,545 |  |  | $ | 106,344 |
Components of Deferred Income Tax Amounts | The components of the deferred income tax amounts at December 31, 2015 and 2014, were as follows (in thousands):
|  | December 31,
|  | 2015 |  | 2014
Deferred Income Tax Assets |  |  |  |
Provision for bad debts |  | $ | 11,092 |  |  | $ | 9,210 |
Deferred compensation and other benefit obligations |  | 96,948 |  |  | 83,065 |
Workers’ compensation |  | 8,206 |  |  | 9,138 |
Stock-based compensation |  | 15,814 |  |  | 14,572 |
Credits and net operating loss carryforwards |  | 35,499 |  |  | 39,309 |
Other |  | 23,885 |  |  | 25,316 |
Total deferred income tax assets |  | 191,444 |  |  | 180,610 |
Deferred Income Tax Liabilities |  |  |  |
Amortization of intangible assets |  | (26,960 | ) |  | (25,060 | )
Property and equipment basis differences |  | (11,890 | ) |  | (12,384 | )
Other |  | (9,720 | ) |  | (7,261 | )
Total deferred income tax liabilities |  | (48,570 | ) |  | (44,705 | )
Valuation allowance |  | (26,329 | ) |  | (29,561 | )
Total deferred income tax assets, net |  | $ | 116,545 |  |  | $ | 106,344 |
Reconciliation of Total Amounts of Gross Unrecognized Tax Benefits | The following table reconciles the total amounts of gross unrecognized tax benefits from January 1, 2013 to December 31, 2015 (in thousands):
|  | December 31,
|  | 2015 |  | 2014 |  | 2013
Balance at beginning of period |  | $ | 4,573 |  |  | $ | 6,110 |  |  | $ | 7,097 |
Gross increases—tax positions in prior years |  | — |  |  | 1 |  |  | 559 |
Gross decreases—tax positions in prior years |  | (1,807 | ) |  | (333 | ) |  | (369 | )
Gross increases—tax positions in current year |  | 120 |  |  | 35 |  |  | 38 |
Settlements |  | (520 | ) |  | — |  |  | — |
Lapse of statute of limitations |  | (1,552 | ) |  | (1,240 | ) |  | (1,215 | )
Balance at end of period |  | $ | 814 |  |  | $ | 4,573 |  |  | $ | 6,110 |

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