Income Taxes (Details 2) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
DEFERRED TAX ASSETS:
Accounting reserves and accruals	$ 32,521	$ 33,615
Defined benefit plan	10,898	4,872
Investments in stock and derivatives	1,081	5,002
Rent escalation	24,574	22,443
Federal and State net operating loss carryforwards	113,015	74,606
Tax credits and other carryforwards	6,263	4,293
Investments in partnerships	3,323	3,796
Other assets	16,568	14,113
Total deferred tax assets	208,243	162,740
Valuation allowance	(19,222)	(18,097)
Total deferred tax assets, net of valuation allowance	189,021	144,643
DEFERRED TAX LIABILITIES:
Property and equipment, net	272,925	222,659
Goodwill and other intangibles	2,922	1,685
Other liabilities	12,752	14,944
Total deferred tax liabilities	288,599	239,288
Net deferred tax liabilities	99,578	94,645
Reconciliation of beginning and ending gross amount of unrecognized tax benefits
Unrecognized tax benefits at beginning of year	18,952	16,123	12,417
Additions (reductions) based on tax positions related to the current year	(286)	3,084	1,818
Additions for tax positions of prior years	147	10,293	3,937
Reductions for tax positions of prior years	(4,672)	(10,548)	(2,049)
Unrecognized tax benefits at end of year	$ 14,141	$ 18,952	$ 16,123