DEBT - 2015 Revolving Credit Facility (Details) - Revolving Credit Facility - 2015 Revolving Credit Facility $ in Thousands						12 Months Ended
	Apr. 07, 2016 USD ($)	Oct. 14, 2015 USD ($)	Jul. 10, 2015 USD ($)	Apr. 08, 2015 USD ($)	Apr. 07, 2015 USD ($) installment	Dec. 31, 2015 USD ($)	Dec. 31, 2016 USD ($)
Line of Credit Facility
Maximum borrowing capacity					$ 59,500
Quarterly reduction of total amount committed					$ 1,641
Number of quarterly installments | installment					20
Period after agreement date for first periodic payment					3 months
Commitment fee on unused daily average unutilized commitment (as a percent)					1.50%
Drawdowns during the period		$ 21,218	$ 10,000	$ 25,000		$ 56,218
Amount of amortization postponed from current due date	$ 1,641
Debt service required	$ 3,241
Long-term debt						$ 56,218	$ 0
LIBOR
Line of Credit Facility
Reference rate for interest payable					LIBOR
Minimum | LIBOR
Line of Credit Facility
Applicable margin over reference rate for interest payable					3.40%
Maximum | LIBOR
Line of Credit Facility
Applicable margin over reference rate for interest payable					4.25%