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FAIR VALUE MEASUREMENTS Table 3 (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Fair Value and Carrying Value of Debt and Note Receivable from Counterparty [Line Items]    
Fair value, long-term debt $ 2,929,438 $ 2,764,242
Carrying amount, long-term debt (3,079,349) (2,749,452)
Axeon [Member]    
Fair Value and Carrying Value of Debt and Note Receivable from Counterparty [Line Items]    
Fair value, Axeon Term Loan 172,123 164,386
Carrying amount, Axeon Term Loan $ 170,352 $ 169,235