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Income Taxes (Tables)

12 Months Ended

Dec. 31, 2014

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,
		2014				2013				2012
Federal:
Current		$	167,745			$	134,938			$	111,940
Deferred			2,262				14,784				19,814
			170,007				149,722				131,754
State:
Current			21,109				17,037				13,980
Deferred			297				1,136				1,530
			21,406				18,173				15,510
Total		$	191,413			$	167,895			$	147,264

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,
		2014				2013				2012
Tax at statutory rate			35.00	%			35.00	%			35.00	%
State income tax, net of federal benefit			2.74				2.63				2.60
Non-deductible expenses			0.33				0.27				0.36
Change in accrual estimates relating to uncertain tax positions			(0.59	)			(0.48	)			(0.15	)
Other, net			0.15				0.02				0.13
Income tax provision			37.63	%			37.44	%			37.94	%

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, 2014												December 31, 2013
		Total				Current				Non- Current				Total				Current				Non- Current
Allowance for uncollectible accounts		$	48,178			$	48,178			$	—			$	42,425			$	42,425			$	—
Reserves and accruals			62,708				26,066				36,642				52,519				18,341				34,178
Stock-based compensation			14,354				8,346				6,008				16,457				3,628				12,829
Net operating loss carryforward			10,933				1,504				9,429				6,385				3,744				2,641
Property and equipment			1,524				—				1,524				1,310				—				1,310
Other			1,461				583				878				446				446				—
Total deferred tax assets			139,158				84,677				54,481				119,542				68,584				50,958
Amortization			(214,968	)			—				(214,968	)			(162,399	)			—				(162,399	)
Accrual to cash adjustment			(38,524	)			(38,524	)			—				(37,818	)			(37,818	)			—
Other			(192	)			(192	)			—				—				—				—
Total deferred tax liabilities			(253,684	)			(38,716	)			(214,968	)			(200,217	)			(37,818	)			(162,399	)
Net deferred tax (liability) asset		$	(114,526	)		$	45,961			$	(160,487	)		$	(80,675	)		$	30,766			$	(111,441	)

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, 2014, 2013 and 2012 (in thousands):

		Years Ended December 31,
		2014				2013				2012
Balance at beginning of year		$	14,902			$	13,072			$	16,165
Increases related to prior year tax positions			40				338				102
Decreases related to prior year tax positions			—				(38	)			—
Increases related to current year tax positions			3,750				2,955				2,478
Decreases related to current year tax positions			—				—				(3,671	)
Decreases related to lapse of statutes of limitations			(1,527	)			(1,425	)			(2,002	)
Balance at end of year		$	17,165			$	14,902			$	13,072

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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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