Income Taxes (Tables)

12 Months Ended

Dec. 31, 2011

Income Taxes [Abstract]

Provision for income taxes

	For the Years Ended December 31,
	2011		2010		2009
Federal:
Current	$	45,765	$	51,717	$	49,416
Deferred		17,330		11,536		20,910
		63,095		63,253		70,326
State:
Current		10,710		12,892		10,564
Deferred		2,222		1,957		3,690
		12,932		14,849		14,254
	$	76,027	$	78,102	$	84,580

Net deferred income tax assets (liabilities)

	December 31,
	2011			2010
Current deferred income tax assets:
Accounts receivable	$	5,362		$	4,996
State taxes		4,469			5,329
Other liabilities and reserves		8,112			6,528
Other assets		7,046			904
Inventory		1,321			1,262
Total current deferred income tax assets	$	26,310		$	19,019
Non-current deferred income tax (liabilities) assets:
Net operating loss carryforwards	$	29,362		$	31,377
Write-down of assets		1,222			1,216
Start-up costs		335			333
Other assets		31,306			25,826
Intangible assets		(128,947	)		(113,685	)
Property and equipment		(27,131	)		(19,105	)
Unrealized loss on investments		1,961			1,950
Share-based compensation		6,416			6,115
Valuation allowance		(15,753	)		(16,158	)
Total non-current deferred income tax liabilities, net	$	(101,229	)	$	(82,131	)

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

	For Years Ended December 31,
	2011			2010			2009
Federal income tax at statutory rate		35.0	%		35.0	%		35.0	%
State taxes, net of Federal benefit		4.9			6.0			4.1
Goodwill impairment		4.3			—			—
Miscellaneous		0.1			0.5			0.1
		44.3	%		41.5	%		39.2	%