LEASES - Components of Lease Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
LEASES
Operating lease costs	$ 8,753	$ 8,069
Finance lease costs:
Amortization of assets	15,448	20,555
Interest on lease liabilities	2,584	3,264
Total finance lease costs	18,032	23,819
Variable and short-term lease costs	2,508	2,066
Total lease costs	$ 29,293	$ 33,954