LEASES - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Leases [Abstract]
Right-of-use operating lease assets	$ 234,358		$ 241,342
Operating Lease, Liability, Current	38,373		38,296
Operating Lease, Liability, Noncurrent	248,758		257,424
Finance Lease, Right-of-Use Asset	195,354		170,155
Finance Lease, Liability, Current	76,123		63,454
Finance Lease, Liability, Noncurrent	103,532		$ 96,183
Operating Lease Expense, Net	14,307	$ 15,004
Finance Lease, Right-of-Use Asset, Amortization	11,574	4,460
Finance Lease, Interest Expense	2,101	1,027
Finance Lease, Cost	13,675	5,487
Finance And Operating Lease, Lessee Expense	27,982	20,491
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability	2,865	12,875
Finance Lease, Interest Payment on Liability	2,101	1,027
Operating Lease, Payments	$ 15,457	$ 16,659
Operating Lease, Weighted Average Remaining Lease Term	8 years 9 months 18 days	9 years 3 months 18 days
Finance Lease, Weighted Average Remaining Lease Term	2 years 4 months 24 days	3 years 1 month 6 days
Operating Lease, Weighted Average Discount Rate, Percent	5.60%	5.90%
Finance Lease, Weighted Average Discount Rate, Percent	5.16%	5.50%