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Income Taxes (Tables)

12 Months Ended

Dec. 31, 2013

Income Tax Disclosure [Abstract]

Summary of Components of Income Tax Provision

The components of the income tax provision are as follows (in thousands):

		December 31,
		2013				2012				2011
Federal:
Current		$	134,938			$	111,940			$	113,290
Deferred			14,784				19,814				7,486
			149,722				131,754				120,776
State:
Current			17,037				13,980				13,895
Deferred			1,136				1,530				577
			18,173				15,510				14,472
Total		$	167,895			$	147,264			$	135,248

Schedule of Differences Between Effective Rate and United States Federal Income Tax Statutory Rate

The differences between the effective rate and the United States federal income tax statutory rate are as follows:

		December 31,
		2013				2012				2011
Tax at statutory rate			35.00	%			35.00	%			35.00	%
State income tax, net of federal benefit			2.63				2.60				2.66
Non-deductible expenses			0.27				0.36				0.32
Change in accrual estimates relating to uncertain tax positions			(0.48	)			(0.15	)			0.44
Other, net			0.02				0.13				(0.13	)
Income tax provision			37.44	%			37.94	%			38.29	%

Significant Components of Deferred Income Tax Assets And Liabilities

The significant components of deferred income tax assets and liabilities are as follows (in thousands):

		December 31, 2013												December 31, 2012
		Total				Current				Non- Current				Total				Current				Non- Current
Allowance for uncollectible accounts		$	42,425			$	42,425			$	—			$	44,232			$	44,232			$	—
Reserves and accruals			52,519				49,128				3,391				43,345				39,942				3,403
Stock-based compensation			16,457				10,914				5,543				18,444				11,856				6,588
Net operating loss carryforward			6,385				6,385				—				5,624				5,624				—
Property and equipment			1,310				—				1,310				802				—				802
Other			446				446				—				509				509				—
Total deferred tax assets			119,542				109,298				10,244				112,956				102,163				10,793
Amortization			(162,399	)			—				(162,399	)			(136,670	)			—				(136,670	)
Accrual to cash adjustment			(37,818	)			(37,818	)			—				(33,129	)			(33,129	)			—
Total deferred tax liabilities			(200,217	)			(37,818	)			(162,399	)			(169,799	)			(33,129	)			(136,670	)
Net deferred tax (liability) asset		$	(80,675	)		$	71,480			$	(152,155	)		$	(56,843	)		$	69,034			$	(125,877	)

Schedule of Activity Related to Gross Unrecognized Tax Benefits

The following table summarizes the activity related to the Company’s liability for uncertain tax positions for the years ended December 31, 2013, 2012 and 2011 (in thousands):

		Years Ended December 31,
		2013				2012				2011
Balance at beginning of year		$	13,072			$	16,165			$	22,290
Increases related to prior year tax positions			338				102				44
Decreases related to prior year tax positions			(38	)			—				—
Increases related to current year tax positions			2,955				2,478				2,541
Decreases related to current year tax positions			—				(3,671	)			(7,203	)
Settlements			—				—				13
Decreases related to lapse of statutes of limitations			(1,425	)			(2,002	)			(1,520	)
Balance at end of year		$	14,902			$	13,072			$	16,165

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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.

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Tabular disclosure of the components of net deferred tax asset or liability recognized in an entity's statement of financial position, including the following: the total of all deferred tax liabilities, the total of all deferred tax assets, the total valuation allowance recognized for deferred tax assets.

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Tabular disclosure of the reconciliation using percentage or dollar amounts of the reported amount of income tax expense attributable to continuing operations for the year to the amount of income tax expense that would result from applying domestic federal statutory tax rates to pretax income from continuing operations.

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Tabular disclosure of tax positions taken in the tax returns filed or to be filed for which it is more likely than not that the tax position will not be sustained upon examination by taxing authorities (i.e., uncertain tax positions) and other types of income tax contingencies, including: (1) the policy on classification of interest and penalties; (2) a tabular reconciliation of the total amounts of unrecognized tax benefits at the beginning and end of the period; the total amount(s) of: (3) unrecognized tax benefits that, if recognized, would affect the effective tax rate, and (4) interest and penalties recognized in each of the income statement and balance sheet; (5) for positions for which it is reasonably possible that the total amounts unrecognized will significantly change within 12 months of the reporting date the: (i) nature of the uncertainty, (ii) nature of the event that could occur that would cause the change, and (iii) an estimate of the range of the reasonably possible change or a statement that an estimate of the range cannot be made; and (6) a description of tax years that remain subject to examination by major tax jurisdictions.

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