Income Taxes (Tables)

12 Months Ended

Dec. 31, 2012

Income Tax Disclosure [Abstract]

Provision for income taxes

	For the Years Ended December 31,
	2012			2011		2010
Federal:
Current	$	51,342		$	45,765	$	51,717
Deferred	(27,103		)	17,330		11,536
	24,239			63,095		63,253
State:
Current	9,896			10,710		12,892
Deferred	(5,081		)	2,222		1,957
	4,815			12,932		14,849
Foreign:
Current	4,035			—		—
Deferred	(1,214		)	—		—
	2,821			—		—
	$	31,875		$	76,027	$	78,102

Net deferred income tax assets (liabilities)

	December 31,
	2012				2011
Current deferred income tax assets:
Accounts receivable	$	6,085			$	5,362
State taxes	2,471				4,469
Other liabilities and reserves	9,716				8,112
Other assets	7,119				7,046
Inventory	1,275			1,321	1,321
Valuation allowance	(4,087		)		—
Total current deferred income tax assets	$	22,579			$	26,310
Non-current deferred income tax (liabilities) assets:
Net operating loss carryforwards	$	29,805			$	29,362
Write-down of assets	1,222				1,222
Start-up costs	335				335
Other assets	24,955				31,306
Intangible assets	(107,112		)		(128,947		)
Property and equipment	(22,649		)		(27,131		)
Unrealized loss on investments	—				1,961
Share-based compensation	7,377				6,416
Valuation allowance	(9,779		)		(15,753		)
Total non-current deferred income tax liabilities, net	$	(75,846	)		$	(101,229	)

Reconciliation of provision for income taxes to the amount computed at the Federal statutory rate

	For Years Ended December 31,
	2012		2011		2010
Federal income tax at statutory rate	35.0	%	35.0	%	35.0	%
State taxes, net of Federal benefit	4.1		4.9		6.0
Goodwill impairment	4.6		4.3		—
AVC gain	(2.6	)	—		—
Foreign rate differential	(1.1	)	—		—
Miscellaneous	1.2		0.1		0.5
	41.2	%	44.3	%	41.5	%