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Fair Value Measurements (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2012
Significant Other Observable Inputs (level 2)
Recurring basis
Dec. 31, 2011
Significant Other Observable Inputs (level 2)
Recurring basis
Dec. 31, 2012
Significant Unobservable Inputs (Level 3)
Nonrecurring basis
Dec. 31, 2011
Significant Unobservable Inputs (Level 3)
Nonrecurring basis
Summarizes the valuation of interest rate swaps and impaired assets          
Interest rate swaps asset (liability)   $ (9,916) $ (19,446)    
Impaired long-lived assets       $ 35,654 $ 1,463
Weighted average disposal period of impaired fleet assets 4 years        
Weighted average discount rate of expected proceeds on impaired fleet assets (as a percent) 10.40%        
Disposition of impaired fleet assets minimum time required 12 months