RESTRUCTURING AND IMPAIRMENT CHARGES (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Restructuring Cost and Reserve [Line Items]
Restructuring and impairment charges	$ 1,457	$ 10,329	$ 12,019
Tangible asset impairment charges		900	7,700
Impairment of intangible assets			4,300
Impairment of long-lived assets	$ 1,500	2,400	$ 12,000
Employee separation and severance costs
Restructuring Cost and Reserve [Line Items]
Restructuring costs		3,500
Contract termination
Restructuring Cost and Reserve [Line Items]
Restructuring costs		$ 3,400