LEASES - Balance Sheet Information (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Lease information
Finance leases - Right-of-use assets	$ 41,896
Finance lease liabilities	65,599
Operating leases - Right-of-use assets	55,302	$ 41,698
Operating lease liabilities	$ 53,595	$ 46,391
Operating Lease, Liability, Statement of Financial Position [Extensible List]	Accounts Payable and Accrued Liabilities	Accounts Payable and Accrued Liabilities
Weighted-average remaining lease term - finance leases	43 years 6 months	0 years
Weighted-average remaining lease term - operating leases	34 years 9 months 18 days	35 years 10 months 24 days
Weighted-average discount rate - finance leases	3.25%	0.00%
Weighted-average discount rate - operating leases	4.46%	4.74%