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FAIR VALUE MEASUREMENTS Table 3 (Details) - USD ($)
$ in Thousands
Jun. 30, 2016
Dec. 31, 2015
Fair Value and Carrying Value of Debt and Note Receivable from Counterparty [Line Items]    
Fair value, long-term debt $ 3,204,542 $ 2,929,438
Carrying amount, long-term debt 3,205,693 3,055,612
Axeon [Member]    
Fair Value and Carrying Value of Debt and Note Receivable from Counterparty [Line Items]    
Fair value, Axeon Term Loan 174,397 172,123
Carrying amount, Axeon Term Loan $ 170,460 $ 170,352