Other Long-term Liabilities, Net (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Accrued Liabilities and Other Liabilities, Noncurrent [Line Items]
Accrued insurance liability	$ 40,542	$ 39,575
Unfavorable leases, net of accumulated amortization of $20,083 and $18,891 at June 30, 2012 and December 31, 2011	59,918	62,012
Accumulated amortization, unfavorable leases	20,083	18,891
Deferred gain on Sale-Leaseback Transaction, net of accumulated amortization of $537 at June 30, 2012	40,255	0
Accumulated amortization, deferred gain on sale-leaseback transaction	537
Other long-term liabilities	22,738	23,288
Total other long-term liabilities, net	259,871	218,752
Partner equity plan [Member]
Accrued Liabilities and Other Liabilities, Noncurrent [Line Items]
Partner equity plan obligation	81,492	77,642
Supplemental partner equity plan [Member]
Accrued Liabilities and Other Liabilities, Noncurrent [Line Items]
Partner equity plan obligation	$ 14,926	$ 16,235