RIGHT-OF-USE ASSETS AND LEASES - Components of Lease Right-of-Use Assets and Liabilities (Details) $ in Thousands	Dec. 31, 2019 USD ($)
Assets
Operating lease, right-of-use assets	$ 77,062
Liabilities
Operating lease liabilities, current	4,320
Operating lease liabilities, non-current	86,187
Total operating lease liabilities	$ 90,507