Income taxes (Tables)

12 Months Ended

Dec. 31, 2013

Components of Income Tax Expense (benefit)

Income tax expense (benefit) consisted of the following:

	Year ended December 31,
	2013			2012		2011
Current:
Federal	$	334,258		$	239,232	$	202,733
State		68,715			49,178		42,191
International		1,764			660		—
Total current income tax	$	404,737		$	289,070	$	244,924
Deferred:
Federal		(6,695	)		64,195		63,661
State		(8,941	)		6,498		7,140
International		746			—		—
Total deferred income tax	$	(14,890	)	$	70,693	$	70,801
	$	389,847		$	359,763	$	315,725

Allocation of Income Tax Expense (Benefit)

The allocation of income tax expense (benefit) was as follows:

	Year ended December 31,
	2013			2012			2011
Continuing operations	$	381,013		$	359,845		$	325,292
Discontinued operations		(84	)		(82	)		(8,873	)
Gain (loss) on discontinued operations		8,918			—			(694	)
	$	389,847		$	359,763		$	315,725

Reconciliation between our Effective Tax Rate from Continuing Operations and the U.S. Federal Income Tax Rate

The reconciliation between the Company’s effective tax rate from continuing operations and the U.S. federal income tax rate is as follows:

	Year ended December 31,
	2013			2012			2011
Federal income tax rate		35.0	%		35.0	%		35.0	%
State income taxes, net of federal benefit		3.8			4.0			4.1
International rate differential		0.1			—			—
Changes in deferred tax valuation allowances		0.3			—			(0.3	)
Contingent earn-out adjustments		(2.6	)		—			—
Other		1.4			1.1			0.9
Impact of noncontrolling interests primarily attributable to non-tax paying entities		(4.1	)		(4.2	)		(4.2	)
Effective tax rate		33.9	%		35.9	%		35.5	%

Deferred Tax Assets and Liabilities Arising from Temporary Differences

Deferred tax assets and liabilities arising from temporary differences associated with continuing operations were as follows:

	December 31,
	2013			2012
Receivables	$	63,001		$	126,263
Accrued liabilities		258,562			231,500
Loss contingency reserve		139,844			—
Net operating loss carryforwards		96,212			103,458
Other		66,839			55,488
Deferred tax assets		624,458			516,709
Valuation allowance		(13,860	)		(12,585	)
Net deferred tax assets		610,598			504,124
Intangible assets		(798,106	)		(698,480	)
Property and equipment		(210,008	)		(186,374	)
Other		(5,462	)		(10,780	)
Deferred tax liabilities		(1,013,576	)		(895,634	)
Net deferred tax liabilities	$	(402,978	)	$	(391,510	)

Reconciliation of the Beginning and Ending Liability for Unrecognized Tax Benefits that Do Not Meet the More-Likely-than-not Threshold

A reconciliation of the beginning and ending liability for unrecognized tax benefits that do not meet the more-likely-than-not threshold were as follows:

	Year ended December 31,
	2013			2012
Balance beginning	$	67,546		$	8,943
Additions for tax positions related to current year		6,005			2,102
(Reductions) additions for tax positions related to prior years		(3,901	)		58,442
Reductions related to lapse of applicable statute		(8,480	)		(1,941	)
Reductions related to settlements with taxing authorities		(632	)		—
Balance ending	$	60,538		$	67,546