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LONG-LIVED ASSETS - Intangible Assets (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Mar. 31, 2017
INTANGIBLE ASSETS      
Goodwill $ 4,993 $ 4,993  
Cost Basis 25,248 25,248  
Accumulated Amortization (11,054) (9,170)  
Net Book Value $ 6,602 $ 16,078  
Remaining Weighted Average Amortization Period 6 years 6 months 8 years 9 months 18 days  
Impairment of assets $ (7,592)    
Amortization expense 1,884 $ 1,764  
Impairment of goodwill 4,993    
Estimated future amortization expense      
2019 812    
2020 812    
2021 812    
2022 812    
2023 786    
2024 and thereafter 2,568    
Net Book Value 6,602 16,078  
Gearing      
INTANGIBLE ASSETS      
Impairment of assets $ 0 0  
Minimum      
INTANGIBLE ASSETS      
Estimated useful life 6 years    
Maximum      
INTANGIBLE ASSETS      
Estimated useful life 20 years    
Noncompete agreements      
INTANGIBLE ASSETS      
Cost Basis $ 170 170  
Accumulated Amortization (54) (26)  
Net Book Value $ 116 $ 144  
Remaining Weighted Average Amortization Period 4 years 1 month 6 days 5 years 1 month 6 days  
Estimated future amortization expense      
Net Book Value $ 116 $ 144  
Customer relationships      
INTANGIBLE ASSETS      
Cost Basis 15,979 15,979  
Accumulated Amortization (6,369) (4,992)  
Net Book Value $ 2,018 $ 10,987  
Remaining Weighted Average Amortization Period 6 years 9 months 18 days 8 years  
Impairment of assets $ (7,592)    
Estimated future amortization expense      
Net Book Value 2,018 $ 10,987  
Trade names      
INTANGIBLE ASSETS      
Cost Basis 9,099 9,099  
Accumulated Amortization (4,631) (4,152)  
Net Book Value $ 4,468 $ 4,947  
Remaining Weighted Average Amortization Period 9 years 6 months 10 years 6 months  
Estimated future amortization expense      
Net Book Value $ 4,468 $ 4,947  
Red Wolf      
INTANGIBLE ASSETS      
Goodwill $ 4,993 $ 4,993 $ 5,568
Remaining Weighted Average Amortization Period 9 years 4 months 24 days    
Impairment of assets $ 0    
Red Wolf | Minimum      
INTANGIBLE ASSETS      
Estimated useful life 4 years    
Red Wolf | Maximum      
INTANGIBLE ASSETS      
Estimated useful life 10 years    
Red Wolf | Noncompete agreements      
INTANGIBLE ASSETS      
Remaining Weighted Average Amortization Period 6 years    
Red Wolf | Customer relationships      
INTANGIBLE ASSETS      
Remaining Weighted Average Amortization Period 9 years    
Red Wolf | Trade names      
INTANGIBLE ASSETS      
Remaining Weighted Average Amortization Period 14 years    
Measurement Input, Discount Rate | Red Wolf      
INTANGIBLE ASSETS      
Weighted average cost of capital 15.00%    
Measurement Input, Discount Rate | Red Wolf | Customer relationships      
INTANGIBLE ASSETS      
Weighted average cost of capital 18.50%    
Measurement Input, Discount Rate | Red Wolf | Goodwill      
INTANGIBLE ASSETS      
Weighted average cost of capital 18.60%