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SEGMENT INFORMATION - Other disclosures (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Concentration Risk [Line Items]
Revenue	$ 133,339	$ 101,242	$ 92,239	$ 278,285	$ 276,088	$ 328,968	$ 323,887	$ 362,646	$ 605,105	$ 1,291,589	$ 1,528,930
Geographic concentration risk | UNITED STATES | Revenue
Concentration Risk [Line Items]
Revenue									$ 605,100	$ 1,283,400	$ 1,480,400
Concentration risk (as a percent)									100.00%	99.40%	96.80%
Geographic concentration risk | UNITED STATES | Long Lived Asset
Concentration Risk [Line Items]
Long-lived assets	$ 350,400				452,400				$ 350,400	$ 452,400	$ 492,400
Concentration risk (as a percent)									100.00%	99.80%	97.90%
Geographic concentration risk | CANADA | Revenue
Concentration Risk [Line Items]
Revenue										$ 8,200	$ 48,600
Concentration risk (as a percent)										0.60%	3.20%
Geographic concentration risk | CANADA | Long Lived Asset
Concentration Risk [Line Items]
Long-lived assets					$ 900					$ 900	$ 10,500
Concentration risk (as a percent)										0.20%	2.10%

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