RESTRUCTURING - Summary of Restructuring Charges (Details) - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 0	$ 0	$ 2,599,000
Asset impairments	0	0	1,100,000
Restructuring Plan 2018
Restructuring Cost and Reserve [Line Items]
Restructuring charges	0	0	2,599,000
Redundancy and employee severance and benefit arrangements
Restructuring Cost and Reserve [Line Items]
Restructuring charges	0	0	1,575,000
Redundancy and employee severance and benefit arrangements | Restructuring Plan 2018
Restructuring Cost and Reserve [Line Items]
Restructuring charges	0	0	1,575,000
Asset impairments
Restructuring Cost and Reserve [Line Items]
Asset impairments	0	0	1,124,000
Asset impairments | Restructuring Plan 2018
Restructuring Cost and Reserve [Line Items]
Asset impairments	0	0	1,124,000
Lease loss reserves (benefit)
Restructuring Cost and Reserve [Line Items]
Restructuring reserve, accrual adjustment	0	0	(100,000)
Lease loss reserves (benefit) | Restructuring Plan 2018
Restructuring Cost and Reserve [Line Items]
Restructuring reserve, accrual adjustment	$ 0	$ 0	$ (100,000)