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FAIR VALUE MEASUREMENTS (Details)
$ in Thousands
6 Months Ended
Jun. 30, 2016
USD ($)
item
Dec. 31, 2015
USD ($)
Fair value of financial assets and liabilities carried at fair value    
Aggregate carrying value of total debt $ 1,400,000 $ 1,300,000
Estimated fair value of total debt $ 1,500,000 1,300,000
Interest rate swap    
Fair value of financial assets and liabilities carried at fair value    
Number of counterparties to derivative contracts who experienced significant downgrades in 2016 | item 0  
Level 2    
Fair value of financial assets and liabilities carried at fair value    
Total liabilities at fair value $ 5,086 5,445
Level 2 | Interest rate swap    
Fair value of financial assets and liabilities carried at fair value    
Derivative Liabilities $ 5,086 $ 5,445