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STOCK-BASED COMPENSATION - 2015 EIP Restricted Stock Units (Details) - 2015 EIP Plan - Restricted Stock Units $ / shares in Units, $ in Thousands									12 Months Ended
	May 17, 2017 shares	Mar. 23, 2017 shares	Oct. 15, 2016	May 18, 2016 shares	Feb. 17, 2016 item shares	Jul. 29, 2015 shares	Jul. 17, 2015 shares	Jul. 13, 2015 shares	Dec. 31, 2017 USD ($) $ / shares shares	Dec. 31, 2016 USD ($) $ / shares shares	Dec. 31, 2015 USD ($) $ / shares shares
Number of Shares
Balance at the beginning of the period (in shares)									66,666	5,821
Granted (in shares)									317,595	66,666	7,440
Vested (in shares)									(164,132)	(5,821)	(1,619)
Balance at the end of the period (in shares)									220,129	66,666	5,821
Number of shares vested									171,572
Weighted Average Grant Date Price, Vested | $ / shares									$ 11.39
Weighted Average Fair Value
Balance at the beginning of the period (in dollars per share) | $ / shares									5.10	$ 71.50
Granted (in dollars per share) | $ / shares									11.05	5.10	$ 71.18
Vested (in dollars per share) | $ / shares									8.68	71.50	70.00
Balance at the end of the period (in dollars per share) | $ / shares									$ 11.01	$ 5.10	$ 71.50
Weighted-average remaining contractual life									1 year 7 months 17 days
Additional disclosures
Total fair value of shares vested | $									$ 1,858	$ 30	$ 116
Unrecognized compensation cost related to nonvested stock awards
Unrecognized compensation cost | $									$ 1,396
Weighted-average period for recognition of unrecognized compensation cost									1 year 7 months 17 days
General and Administrative Expense
Additional disclosures
Recognized nonvested stock amortization expense | $									$ 2,241	$ 405	$ 337
Directors
Stock Awards
Number of common shares outstanding in respect of RSUs									118,838	3,138
Number of Shares
Granted (in shares)	25,197			66,666		5,821		1,619
Vested (in shares)				(3,493)	(2,328)		(1,619)
Additional disclosures
Number of resignations from the Board of Directors | item					2
John C. Wobensmith
Stock Awards
Vesting period of awards			3 years
Number of Shares
Granted (in shares)		292,398
Eugene Davis
Number of Shares
Granted (in shares)	18,234

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