CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY (Unaudited) - USD ($) $ in Thousands	Total	Common Shares	Retained Earnings	AOCI Attributable to Parent [Member]	Non-controlling Interest
Beginning balance (in shares) at Dec. 31, 2018		129,488,675
Beginning balance at Dec. 31, 2018	$ 1,654,550	$ 884,263	$ 672,371	$ 239	$ 97,677
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss) income	27,793		24,794		2,999
Dividends	(35,049)		(35,049)
Issuance of shares under incentive stock plans (in shares)		26,031
Issuance of shares under incentive stock plans	597	$ 597
Stock-based compensation	1,477	$ 1,477
Repurchase of common shares (in shares)		(1,140)
Repurchase of common shares	(33)	$ (33)
Amortization of pension and postretirement plan liabilities	112			112
Foreign currency translation adjustment	6,033			4,680	1,353
Cash flow hedges	(10,686)			(10,884)	198
Distribution to minority shareholder	(3,594)				(3,594)
Ending balance (in shares) at Mar. 31, 2019		129,513,566
Ending balance at Mar. 31, 2019	1,641,200	$ 886,304	662,116	(5,853)	98,633
Beginning balance (in shares) at Dec. 31, 2019		129,331,069
Beginning balance at Dec. 31, 2019	1,537,642	$ 888,177	583,006	(31,202)	97,661
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss) income	26,421		25,854		567
Dividends	(34,813)		(34,813)
Issuance of shares under incentive stock plans (in shares)		2,407
Issuance of shares under incentive stock plans	66	$ 66
Stock-based compensation	1,510	$ 1,510
Repurchase of common shares (in shares)		(152,237)
Repurchase of common shares	(3,152)	$ 0	(3,152)
Amortization of pension and postretirement plan liabilities	217			217
Foreign currency translation adjustment	(44,023)			(33,894)	(10,129)
Cash flow hedges	(83,475)			(82,376)	(1,099)
Distribution to minority shareholder	(725)				(725)
Ending balance (in shares) at Mar. 31, 2020		129,181,239
Ending balance at Mar. 31, 2020	$ 1,399,668	$ 889,753	$ 570,895	$ (147,255)	$ 86,275