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Segments (Details 1) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Reconciliation of net income to Adjusted EBITDA    
Net income $ 42,876 $ 25,322
Add (deduct):    
Income taxes 27,932 9,037
Interest expense 32,133 29,290
Other income (5,422) (5,030)
Depreciation and amortization 36,816 39,140
Impairment of long-lived assets 185 1,015
Loss on sale of assets and other 836 472
Deferred lease expenses 1,123 780
Amortization of long-term prepaid rents 534 667
Share based awards compensation expense 3,315 2,013
Adjusted EBITDA $ 140,328 $ 102,706