LEASES - Right of Use Assets (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Leases [Abstract]
Operating lease, right-of-use asset, statement of financial position	Other long-term assets	Other long-term assets
Right of use assets	$ 91,349	$ 67,651
Operating lease, liability, current, statement of financial position	Other current liabilities	Other current liabilities
Lease liabilities	$ 10,668	$ 18,541
Long-term operating lease liabilities	$ 87,088	$ 59,053