LEASES AND OTHER COMMITMENTS - Supplemental Balance Sheet Information (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Operating leases:
Operating leases - right of use assets	$ 25,450	$ 22,898
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List]	Operating leases - right of use assets	Operating leases - right of use assets
Current operating lease obligations	$ 7,221	$ 6,679
Operating Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration]	Current operating lease obligations	Current operating lease obligations
Long-term operating lease obligations	$ 18,665	$ 16,644
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration]	Long-term operating lease obligations	Long-term operating lease obligations
Total operating lease liabilities	$ 25,886	$ 23,323
Operating Lease, Liability, Statement of Financial Position [Extensible List]	Current operating lease obligations, Long-term operating lease obligations	Current operating lease obligations, Long-term operating lease obligations
Finance leases and assets subject to sale leasebacks:
Property and equipment, at cost	$ 156,379	$ 137,736
Accumulated amortization	(51,436)	(47,699)
Property and equipment, net	104,943	90,037
Finance lease obligations:
Current finance lease obligations	$ 16,834	$ 14,095
Finance Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration]	Current finance lease obligations	Current finance lease obligations
Long-term finance lease obligations	$ 69,688	$ 56,274
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List]	Long-term finance lease obligations	Long-term finance lease obligations
Total finance lease obligations	$ 86,522	$ 70,369
Finance Lease, Liability, Statement of Financial Position [Extensible List]	Current finance lease obligations, Long-term finance lease obligations
Weighted average remaining lease term:
Operating leases	51 months	50 months
Finance leases	37 months	35 months
Weighted average discount rate:
Operating leases	4.14%	4.53%
Finance leases	3.30%	3.69%