Income Taxes (Tables)

12 Months Ended

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