LEASES - Balance Sheet Classification (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Assets:
Operating lease right-of-use assets	$ 297,296	$ 310,238
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List]	us-gaap:AssetsAbstract	us-gaap:AssetsAbstract
Finance lease assets	$ 618	$ 906
Total leased assets	297,914	311,144
Liabilities, Current [Abstract]
Current portion of operating lease liabilities	$ 25,390	$ 23,736
Finance Lease, Liability, Current, Statement of Financial Position [Extensible List]	us-gaap:LiabilitiesCurrentAbstract	us-gaap:LiabilitiesCurrentAbstract
Finance lease, current	$ 238	$ 231
Liabilities, Noncurrent [Abstract]
Operating lease liabilities, less current portion	$ 282,696	$ 295,636
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List]	us-gaap:LongTermDebtAndCapitalLeaseObligations	us-gaap:LongTermDebtAndCapitalLeaseObligations
Finance lease, noncurrent	$ 376	$ 445
Total lease liabilities	308,700	320,048
Accumulated amortization of finance leases	$ 422	$ 1,522