CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME/(LOSS) (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Statement of Comprehensive Income [Abstract]
Net income	$ 7,594	$ 29,408
Other comprehensive income/(loss), before tax:
Foreign currency translation and other adjustments	(24,955)	(2,152)
Amortization of pension liability adjustments:
Prior service credit	(1,114)	(1,105)
Net actuarial loss	1,244	1,121
Payments and amortization related to interest rate swaps included in earnings	407	(452)
Derivative valuation adjustment	(10,764)	(3,377)
Income taxes related to items of other comprehensive income/(loss):
Amortization of pension liability adjustment	(32)	(5)
Payments and amortization related to interest rate swaps included in earnings	(104)	115
Derivative valuation adjustment	2,753	863
Comprehensive income	(24,971)	24,416
Comprehensive income/(loss) attributable to the noncontrolling interest	(1,406)	210
Comprehensive income/(loss) attributable to the Company	$ (23,565)	$ 24,206