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FAIR VALUE MEASUREMENTS (Details) (Significant unobservable inputs, Level 3, USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Carrying Value
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Debt $ 777,670 $ 328,473
Fair Value
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Debt $ 823,603 $ 364,329