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DEBT - ASU 2015-03 (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Line of Credit Facility      
Long-term debt, noncurrent $ (507,239)   $ (508,444)
Amortization of deferred financing costs 573 $ 729  
Interest Expense      
Line of Credit Facility      
Amortization of deferred financing costs 573 $ 729  
Adoption Of ASU 2015-03      
Line of Credit Facility      
Deferred financing costs, net 10,784   11,357
Long-term debt, noncurrent $ 10,784   $ 11,357