LEASES AND OTHER COMMITMENTS - Supplemental Balance Sheet Information (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Operating leases:
Operating leases - right of use assets	$ 21,342	$ 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	$ 6,475	$ 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	$ 15,287	$ 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	$ 21,762	$ 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	$ 157,548	$ 137,736
Accumulated amortization	(51,820)	(47,699)
Property and equipment, net	105,728	90,037
Finance lease obligations:
Current finance lease obligations	$ 16,983	$ 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	$ 70,033	$ 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	$ 87,016	$ 70,369
Weighted average remaining lease term:
Operating leases	48 months	50 months
Finance leases	37 months	35 months
Weighted average discount rate:
Operating leases	4.55%	4.53%
Finance leases	3.34%	3.69%