SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Debt Issuance Costs and Capitalized Interest (Details) - USD ($) $ in Thousands		3 Months Ended	12 Months Ended
	Aug. 31, 2020	Dec. 31, 2020	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Debt Issuance Costs
Debt issuance costs, net of amortization		$ 2,800	$ 2,800
Amortization of Financing Costs			764	$ 538	$ 538
Capitalized Interest
Capitalized interest		$ 16,500	$ 6,800	$ 5,800	$ 2,300
Revolving credit facility
Debt Issuance Costs
Unamortized debt issuance cost	$ 476
Amortization of Financing Costs	$ 95