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DEBT - Expenses (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Line of Credit Facility          
Deferred financing costs, noncurrent $ 15,015   $ 15,015   $ 16,272
Amortization of deferred financing costs     1,867 $ 1,239  
Interest Expense          
Line of Credit Facility          
Amortization of deferred financing costs $ 952 $ 666 $ 1,867 $ 1,239