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FAIR VALUE MEASUREMENTS Table 3 (Details) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Fair Value and Carrying Value of Debt and Note Receivable from Counterparty [Line Items]    
Fair value, long-term debt $ 2,980,166 $ 2,929,438
Carrying amount, long-term debt 3,125,650 3,055,612
Axeon [Member]    
Fair Value and Carrying Value of Debt and Note Receivable from Counterparty [Line Items]    
Fair value, Axeon Term Loan 173,197 172,123
Carrying amount, Axeon Term Loan $ 170,055 $ 170,352