LEASES - Balance Sheet Classification (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Assets:
Operating lease right-of-use assets	$ 282,931	$ 290,296
Finance lease assets	447	508
Total leased assets	283,378	290,804
Liabilities, Current [Abstract]
Current portion of operating lease liabilities	29,429	28,583
Finance lease, current	255	251
Liabilities, Noncurrent [Abstract]
Operating lease liabilities, less current portion	266,435	274,155
Finance lease, noncurrent	224	280
Total lease liabilities	296,343	303,269
Accumulated amortization of finance leases	$ 532	$ 471