Income Taxes (Tables)

12 Months Ended

Dec. 31, 2016

Income Tax Disclosure [Abstract]

Provision (Benefit) for Income Taxes

The provision (benefit) for income taxes for the years ended December 31, 2016, 2015 and 2014, consisted of the following (in thousands):

	Years Ended December 31,
	2016			2015			2014
Current:
Federal	$	156,937		$	181,640		$	146,633
State	34,927			36,281			33,054
Foreign	20,725			13,892			15,377
Deferred:
Federal and state	(3,785		)	(8,398		)	(4,626		)
Foreign	1,917			(181		)	983
	$	210,721		$	223,234		$	191,421

Income Before Provision for Income Taxes

Income before the provision for income taxes for the years ended December 31, 2016, 2015 and 2014, consisted of the following (in thousands):

	Years Ended December 31,
	2016		2015		2014
Domestic	$	494,890	$	528,916	$	446,886
Foreign	59,220		52,114		50,463
	$	554,110	$	581,030	$	497,349

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,
	2016		2015		2014
Federal U.S. income tax rate	35.0	%	35.0	%	35.0	%
State income taxes, net of federal tax benefit	4.2		4.2		4.2
Non-deductible expenses	0.5		0.5		0.6
Non-U.S. income taxed at different rates, net of foreign tax credits	(0.6	)	0.1		(0.2	)
Federal tax credits	(0.8	)	(0.6	)	(0.6	)
Tax impact of uncertain tax positions	—		(0.2	)	(0.1	)
Valuation allowance release, net	(0.1	)	(0.5	)	(0.3	)
Other, net	(0.2	)	(0.1	)	(0.1	)
Effective tax rate	38.0	%	38.4	%	38.5	%

Deferred Portion of Tax Provision (Benefit)

The deferred portion of the tax provision (benefit) consisted of the following (in thousands):

	Years Ended December 31,
	2016			2015			2014
Amortization of franchise rights	$	500		$	514		$	514
Amortization of other intangibles	1,221			1,590			1,241
Accrued expenses, deducted for tax when paid	(6,889		)	(17,664		)	(14,221		)
Capitalized costs for books, deducted for tax	5,901			5,315			8,809
Depreciation	(2,405		)	(5,932		)	(4,147		)
Federal impact of unrecognized tax benefits	75			1,058			44
Foreign tax credit carryforwards	—			3,636			(186		)
Other, net	(271		)	2,904			4,303
	$	(1,868	)	$	(8,579	)	$	(3,643	)

Components of Deferred Income Tax Amounts

The components of the deferred income tax amounts at December 31, 2016 and 2015, were as follows (in thousands):

	December 31,
	2016			2015
Deferred Income Tax Assets
Provision for bad debts	$	10,510		$	11,092
Deferred compensation and other benefit obligations	112,811			96,948
Workers’ compensation	5,634			8,206
Stock-based compensation	16,772			15,814
Credits and net operating loss carryforwards	30,534			35,499
Other	18,116			23,885
Total deferred income tax assets	194,377			191,444
Deferred Income Tax Liabilities
Amortization of intangible assets	(28,681		)	(26,960		)
Property and equipment basis differences	(16,640		)	(11,890		)
Other	(11,658		)	(9,720		)
Total deferred income tax liabilities	(56,979		)	(48,570		)
Valuation allowance	(18,907		)	(26,329		)
Total deferred income tax assets, net	$	118,491		$	116,545

Reconciliation of Total Amounts of Gross Unrecognized Tax Benefits

The following table reconciles the total amounts of gross unrecognized tax benefits from January 1, 2014 to December 31, 2016 (in thousands):

	December 31,
	2016			2015			2014
Balance at beginning of period	$	814		$	4,573		$	6,110
Gross increases—tax positions in prior years	92			—			1
Gross decreases—tax positions in prior years	—			(1,807		)	(333		)
Gross increases—tax positions in current year	114			120			35
Settlements	—			(520		)	—
Lapse of statute of limitations	(289		)	(1,552		)	(1,240		)
Balance at end of period	$	731		$	814		$	4,573