DEBT - Expenses (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Line of Credit Facility
Deferred financing costs, noncurrent	$ 9,618		$ 9,618		$ 11,357
Amortization of deferred financing costs	586		1,739	$ 2,195
Interest Expense
Line of Credit Facility
Amortization of deferred financing costs	$ 586	$ 737	$ 1,739	$ 2,195