LEASES - Supplemental Balance Sheet (Details) - USD ($)	Dec. 31, 2020	Dec. 31, 2019
Leases [Abstract]
Operating lease right-of-use assets, net	$ 150,898,000	$ 165,490,000
Current operating lease liabilities	27,263,000	26,773,000
Operating lease, Long-term operating lease liability	133,069,000	145,124,000
Total operating lease liabilities	160,332,000	171,897,000
Property, plant, and equipment	15,561,000	15,561,000
Accumulated depreciation	6,570,000	5,533,000
Property, plant, and equipment, net	8,991,000	10,028,000
Finance lease, Other current liabilities	945,000	807,000
Finance lease, Other liabilities	10,041,000	10,982,000
Total finance lease liabilities	$ 10,986,000	$ 11,789,000
Weighted average remaining lease term, Operating lease	8 years 7 months 6 days	9 years 2 months 12 days
Weighted average remaining lease term, Finance leases	8 years 8 months 12 days	9 years 8 months 12 days
Weighted average discount rate, Operating leases	3.67%	3.75%
Weighted average discount rate, Finance leases	4.05%	4.05%
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List]	us-gaap:OtherLiabilitiesCurrent	us-gaap:OtherLiabilitiesCurrent