LEASES - Supplemental Balance Sheet (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Leases [Abstract]
Operating lease right-of-use assets	$ 236,903	$ 259,613
Operating lease liabilities (current)	40,439	35,335
Operating lease liabilities (noncurrent)	229,400	253,346
Total operating lease liabilities	$ 269,839	$ 288,681
Weighted Average Remaining Lease Term	8 years	8 years
Weighted Average Discount Rate (percent)	4.90%	4.90%