Consolidated Statements of Comprehensive Income/(Loss) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Statement of Comprehensive Income [Abstract]
Net income	$ 27,609	$ 7,594
Other comprehensive income/(loss), before tax:
Foreign currency translation and other adjustments	(15,439)	(24,955)
Amortization of pension liability adjustments:
Amortization of prior service credit	(1,119)	(1,114)
Net actuarial loss	1,109	1,244
Payments and amortization related to interest rate swaps included in earnings	1,476	407
Derivative valuation adjustment	(478)	(10,764)
Income taxes related to items of other comprehensive income/(loss):
Amortization of prior service cost	336	279
Amortization of net actuarial loss	(333)	(311)
Payments and amortization related to interest rate swaps included in earnings	(381)	(104)
Derivative valuation adjustment	135	2,753
Comprehensive income/(loss)	12,915	(24,971)
Comprehensive income/(loss) attributable to the noncontrolling interest	(183)	(1,406)
Comprehensive income/(loss) attributable to the Company	$ 13,098	$ (23,565)