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SUMMARY OF SIGNIFICANT EVENTS AND ACCOUNTING POLICIES - Other Operating Property and Equipment (Details) - USD ($) $ in Thousands | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Oct. 02, 2019 | Oct. 01, 2019
Other operating property and equipment |  |  |  |
Other operating property and equipment | $ 3,535 | $ 3,655 | $ 3,655 | $ 203,373
Buildings |  |  |  |
Other operating property and equipment |  |  |  |
Estimated useful lives | 20 years |  |  |
Automobiles |  |  |  |
Other operating property and equipment |  |  |  |
Estimated useful lives | 3 years |  |  |
Computers |  |  |  |
Other operating property and equipment |  |  |  |
Estimated useful lives | 3 years |  |  |
Computer software |  |  |  |
Other operating property and equipment |  |  |  |
Estimated useful lives | 5 years |  |  |
Fixtures, furniture and equipment |  |  |  |
Other operating property and equipment |  |  |  |
Estimated useful lives | 5 years |  |  |
Trailers |  |  |  |
Other operating property and equipment |  |  |  |
Estimated useful lives | 7 years |  |  |
Heavy equipment | Minimum |  |  |  |
Other operating property and equipment |  |  |  |
Estimated useful lives | 8 years |  |  |
Heavy equipment | Maximum |  |  |  |
Other operating property and equipment |  |  |  |
Estimated useful lives | 10 years |  |  |

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