Income Taxes (Tables)

12 Months Ended

Dec. 31, 2012

Income Tax Disclosure [Abstract]

Schedule of Provision for (Benefit from) Income Taxes

For the years ended December 31, 2012, 2011, and 2010, the provision for (benefit from) income taxes is comprised of the following:

	2012			2011			2010
Current income tax expense (benefit)
Federal	$	(70	)	$	(70	)	$	—
State		542			1,277			—
Foreign		31			24			—
Total current income tax provision		503			1,231			—
Deferred income tax provision (benefit):
Federal		37,873			11,429			(24,074	)
State		1,106			768			(5,167	)
Total deferred income tax provision (benefit)		38,979			12,197			(29,241	)
Total income tax provision (benefit)	$	39,482		$	13,428		$	(29,241	)

Components of Deferred Income Tax Assets and Liabilities

The components of deferred income tax assets and liabilities as of December 31, 2012 and 2011, are as follows:

	2012			2011
Deferred income tax assets:
Acquisition costs	$	22,651		$	23,866
Net operating loss		222,702			197,241
Self-insurance		7,912			7,507
Deferred revenue		1,077			3,337
Other		5,736			2,477
Total deferred income tax assets		260,078			234,428
Deferred income tax liabilities:
Property and equipment		(199,836	)		(146,002	)
Goodwill		(21,028	)		(14,030	)
Amortization		(11,307	)		(8,429	)
Other		(4,146	)		(3,872	)
Total deferred income tax liabilities		(236,317	)		(172,333	)
Net deferred income tax assets	$	23,761		$	62,095

Schedule of Reconciliation Between U.S. Federal Statutory Income Tax Rate and Company's Effective Income Tax Provision Rate

The reconciliation between the U.S. federal statutory income tax rate and the Company’s effective income tax provision (benefit) rate for the years ended December 31, 2012, 2011, and 2010, is as follows:

	2012			2011			2010
Income tax rate at federal statutory rates		35.00	%		35.00	%		35.00	%
State taxes, net of federal benefit		1.36			5.57			3.67
Other		(2.59	)		0.69			0.47
Income tax rate		33.77	%		41.26	%		39.14	%