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Segments (Details 1) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Reconciliation of net income to Adjusted EBITDA        
Net income $ 52,139 $ 41,009 $ 95,015 $ 66,331
Add (deduct):        
Income taxes 30,844 23,272 58,776 32,309
Interest expense 31,375 29,777 63,508 59,067
Loss on early retirement of debt    4,945    4,945
Other income (63) (443) (5,485) (5,473)
Depreciation and amortization 36,341 39,897 73,157 79,037
Impairment of long-lived assets 311 1,594 496 2,609
Loss on sale of assets and other 469 5,694 1,305 6,166
Deferred lease expenses 1,207 870 2,330 1,650
Amortization of long-term prepaid rents 776 617 1,310 1,284
Share based awards compensation expense 3,553 2,559 6,868 4,572
Adjusted EBITDA $ 156,952 $ 149,791 $ 297,280 $ 252,497