LEASES - Balance Sheet Classification (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Assets
Operating lease right-of-use assets	$ 275,422	$ 290,296
Finance lease assets	386	508
Total leased assets	275,808	290,804
Current
Current portion of operating lease liabilities	30,292	28,583
Finance lease, current	245	251
Noncurrent
Operating lease liabilities, less current portion	258,553	274,155
Finance lease, noncurrent	171	280
Total lease liabilities	289,261	303,269
Accumulated amortization of finance leases	$ 593	$ 471