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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% |  |

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