GOODWILL AND OTHER INTANGIBLE ASSETS (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended	12 Months Ended
	Jun. 30, 2018	Jun. 30, 2018	Dec. 31, 2017	Mar. 31, 2017
INTANGIBLE ASSETS
Goodwill			$ 4,993
Impairment charge	$ (4,993)	$ (4,993)
Cost Basis	25,248	25,248	25,248
Accumulated Amortization	(10,112)	(10,112)	(9,170)
Net Book Value	15,136	$ 15,136	$ 16,078
Remaining Weighted Average Amortization Period		7 years	8 years 9 months 18 days
Estimated future amortization expense
2018	942	$ 942
2019	1,884	1,884
2020	1,884	1,884
2021	1,884	1,884
2022	1,884	1,884
2023 and thereafter	6,658	6,658
Net Book Value	15,136	15,136	$ 16,078
Gearing
INTANGIBLE ASSETS
Impairment of assets		$ 0
Minimum
INTANGIBLE ASSETS
Remaining Weighted Average Amortization Period		5 years
Maximum
INTANGIBLE ASSETS
Remaining Weighted Average Amortization Period		10 years
Red Wolf
INTANGIBLE ASSETS
Goodwill			4,993	$ 5,568
Impairment of assets		$ 0
Fair Value Inputs, Discount Rate		15.00%
Remaining Weighted Average Amortization Period		9 years 4 months 24 days
Red Wolf | Goodwill
INTANGIBLE ASSETS
Fair Value Inputs, Discount Rate		18.60%
Noncompete agreements
INTANGIBLE ASSETS
Cost Basis	170	$ 170	170
Accumulated Amortization	(40)	(40)	(26)
Net Book Value	130	$ 130	$ 144
Remaining Weighted Average Amortization Period		4 years 7 months 6 days	5 years 1 month 6 days
Estimated future amortization expense
Net Book Value	130	$ 130	$ 144
Noncompete agreements | Red Wolf
INTANGIBLE ASSETS
Remaining Weighted Average Amortization Period		6 years
Customer relationships
INTANGIBLE ASSETS
Cost Basis	15,979	$ 15,979	15,979
Accumulated Amortization	(5,680)	(5,680)	(4,992)
Net Book Value	10,299	$ 10,299	$ 10,987
Remaining Weighted Average Amortization Period		7 years 6 months	8 years
Estimated future amortization expense
Net Book Value	10,299	$ 10,299	$ 10,987
Customer relationships | Red Wolf
INTANGIBLE ASSETS
Remaining Weighted Average Amortization Period		9 years
Trade names
INTANGIBLE ASSETS
Cost Basis	9,099	$ 9,099	9,099
Accumulated Amortization	(4,392)	(4,392)	(4,152)
Net Book Value	4,707	$ 4,707	$ 4,947
Remaining Weighted Average Amortization Period		10 years	10 years 6 months
Estimated future amortization expense
Net Book Value	$ 4,707	$ 4,707	$ 4,947
Trade names | Red Wolf
INTANGIBLE ASSETS
Remaining Weighted Average Amortization Period		14 years