INCOME TAXES - Components of Income Tax - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Operating loss carryforwards
Effective tax rate (as a percent)	858.30%	67.60%
Income Tax Benefit, Utilization of Losses at Higher Rate, Coronavirus Aid, Relief, and Economic Security Act	$ 3,100
Increase unrecognized tax benefits	2,100	$ 3,900
Net increase for permanently non-deductible expenses	1,500	3,800
Income tax benefit from investment tax credit		1,200
Loss on sale of Vibrant with no tax benefit	21,500
Operating loss carryforward that will expire	57,300
Operating loss carryforward with no expiration	73,600
Valuation allowance	31,014	39,406
Undistributed earnings of foreign subsidiaries	145,100
Unrecognized benefits, including interest and penalties	40,800	38,600	$ 34,700
Increase from prior period positions	2,100
Increase in unrecognized tax benefits taken during the current period	2,964	$ 3,383	$ 3,408
Settlement of prior year positions	2,900
Federal
Operating loss carryforwards
Operating loss carryforwards	1,100
State
Operating loss carryforwards
Operating loss carryforwards	18,900
Foreign
Operating loss carryforwards
Operating loss carryforwards	$ 110,900