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FAIR VALUE MEASUREMENTS (Details) (USD $)
In Thousands, unless otherwise specified
 6 Months Ended
Jun. 30, 2012
Jun. 30, 2012
Significant Other Observable Inputs (level 2)
Recurring basis
Dec. 31, 2011
Significant Other Observable Inputs (level 2)
Recurring basis
Jun. 30, 2012
Significant Unobservable Inputs (Level 3)
Nonrecurring basis
Jun. 30, 2011
Significant Unobservable Inputs (Level 3)
Nonrecurring basis
Summarizes the valuation of interest rate swaps and impaired assets          
Interest rate swaps asset (liability)   $ (12,062) $ (19,446)    
Impaired long-lived assets       31,311 416
Impaired assets-Discontinued operations       22,035  
Impaired assets-Assets held for sale $ 294     $ 294  
Weighted average disposal period of impaired fleet assets 4 years        
Weighted average discount rate of expected proceeds on impaired fleet assets 10.40%