LEASES - Supplemental Balance Sheet Information (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019	Jun. 30, 2019
Assets
Operating lease right-of-use assets	$ 61,187	$ 66,191	$ 69,094
Liabilities
Short-term operating lease liabilities	15,879	17,603	17,887
Long-term operating lease liabilities	44,158	$ 48,605	51,188
Total operating lease liabilities	$ 60,037		$ 69,075