LEASES - Balance Sheet Classification (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Assets
Operating lease right-of-use assets	$ 267,766	$ 290,296
Finance lease assets	326	508
Total leased assets	268,092	290,804
Current
Current portion of operating lease liabilities	31,174	28,583
Finance lease, current	234	251
Noncurrent
Operating lease liabilities, less current portion	250,505	274,155
Finance lease, noncurrent	119	280
Total lease liabilities	282,032	303,269
Accumulated amortization of finance leases	$ 653	$ 471