LEASES - Supplemental Balance Sheet Information (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019	Jan. 01, 2019
Assets
Operating lease right-of-use assets	$ 55,188	$ 66,191	$ 72,700
Liabilities
Short-term operating lease liabilities	15,891	17,603
Long-term operating lease liabilities	38,010	48,605
Present value of lease liabilities	$ 53,901	$ 66,208	$ 72,400