Condensed Consolidated Statements of Comprehensive (Loss) Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Statement Of Income And Comprehensive Income [Abstract]
Net (loss) income	$ (48,484)	$ 10,896	$ (137,942)	$ 37,219
Unrealized net gain (loss) from cash flow hedging instruments	591	(527)	(935)	(162)
Realized net loss from cash flow hedging instruments	110	322	805	1,015
Foreign currency translation adjustments	2,387	(1,498)	1,772	(1,670)
Defined benefit and postretirement benefit plans	19		36
Other comprehensive income (loss), before tax	3,107	(1,703)	1,678	(817)
Income tax (expense) benefit related to other comprehensive income (loss)	(189)	54	64	(224)
Other comprehensive income (loss), net of tax	2,918	(1,649)	1,742	(1,041)
Comprehensive (loss) income	(45,566)	9,247	(136,200)	36,178
Less: Comprehensive loss (income) attributable to non-controlling interests	553	(1,410)	14,876	(8,017)
Comprehensive (loss) income attributable to common shareholders	$ (45,013)	$ 7,837	$ (121,324)	$ 28,161