SUMMARY OF SIGNIFICANT EVENTS AND ACCOUNTING POLICIES - Other Operating Property and Equipment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Oct. 02, 2019	Oct. 01, 2019	Dec. 31, 2018
Other operating property and equipment
Other operating property and equipment	$ 3,655	$ 3,655	$ 203,373	$ 130,251
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