COMPREHENSIVE INCOME - Reclassification out of Accumulated other Comprehensive Income (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Loss on sale of business	$ 0	$ 0	$ (108)	$ (3,601)
Other – net	(276)	(255)	(3,068)	208
Benefit plans, net	7,328	3,571	22,314	9,072
Net income	34,555	(56,990)	(17,113)	(135,191)
Reclassification out of Accumulated Other Comprehensive Income | Release of currency translation gain with the sale of equity method investment and the sale of business
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Loss on sale of business	0	0	0	(3,176)
Reclassification out of Accumulated Other Comprehensive Income | Derivative financial instruments
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other – net	0	0	0	(202)
Net income	0	0	0	(3,378)
Reclassification out of Accumulated Other Comprehensive Income | Amortization of prior service cost on benefit obligations
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Benefit plans, net	246	515	738	1,385
Net income	$ 246	$ 515	$ 738	$ 1,385