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FAIR VALUE MEASUREMENTS - Balance Sheet Grouping (Details) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Fair Value Measurement [Domain]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash and Cash Equivalents, Fair Value Disclosure $ 162,354  
Reported Value Measurement [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash and Cash Equivalents, Fair Value Disclosure   $ 168,983
Debt Instrument, Fair Value Disclosure 1,239,842 1,242,265
Estimate of Fair Value Measurement [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash and Cash Equivalents, Fair Value Disclosure 162,354 168,983
Debt Instrument, Fair Value Disclosure $ 1,280,025 $ 1,262,483