CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY - USD ($) $ in Thousands	Total	Cumulative Effect, Period of Adoption, Adjustment	Retained Earnings	Retained Earnings Cumulative Effect, Period of Adoption, Adjustment	Accumulated Other Comprehensive (Loss) Income	Common Stock Par Value	Treasury Stock	Capital in Excess of Par Value	Non- Controlling Interest
Beginning balance at Dec. 31, 2019	$ 1,572,252	$ (1,377)	$ 1,523,820	$ (1,377)	$ (341,948)	$ 686	$ (381,238)	$ 770,596	$ 336
Increase (Decrease) in Stockholders' Equity
Net income (loss)	160,845		160,808						37
Foreign currency translation adjustments	19,292				19,282				10
Changes in unrecognized pension gains (losses) and related amortization, net of tax	4,639				4,639
Changes in derivative gains (losses), net of tax	603				603
Stock awards and option exercises	73,061					7	16,377	56,677
Cash dividends declared on common stock	(69,360)		(69,360)
Ending balance at Sep. 30, 2020	1,759,955		1,613,891		(317,424)	693	(364,861)	827,273	383
Beginning balance at Jun. 30, 2020	1,645,986		1,573,392		(361,256)	690	(370,706)	803,511	355
Increase (Decrease) in Stockholders' Equity
Net income (loss)	63,735		63,716						19
Foreign currency translation adjustments	42,425				42,416				9
Changes in unrecognized pension gains (losses) and related amortization, net of tax	1,563				1,563
Changes in derivative gains (losses), net of tax	(147)				(147)
Stock awards and option exercises	29,610					3	5,845	23,762
Cash dividends declared on common stock	(23,217)		(23,217)
Ending balance at Sep. 30, 2020	1,759,955		1,613,891		(317,424)	693	(364,861)	827,273	383
Beginning balance at Dec. 31, 2020	1,850,785		1,643,825		(281,709)	695	(361,583)	849,161	396
Increase (Decrease) in Stockholders' Equity
Net income (loss)	186,107		186,488						(381)
Acquisitions of non-controlling interest	38,543								38,543
Foreign currency translation adjustments	(57,783)				(57,317)				(466)
Changes in unrecognized pension gains (losses) and related amortization, net of tax	7,660				7,660
Changes in derivative gains (losses), net of tax	1,039				1,039
Stock awards and option exercises	71,533					8	18,085	53,440
Cash dividends declared on common stock	(73,493)		(73,493)
Treasury stock purchased	(28,398)						(28,398)
Ending balance at Sep. 30, 2021	1,995,993		1,756,820		(330,327)	703	(371,896)	902,601	38,092
Beginning balance at Jun. 30, 2021	1,986,663		1,734,638		(303,058)	702	(344,382)	898,382	381
Increase (Decrease) in Stockholders' Equity
Net income (loss)	46,894		47,260						(366)
Acquisitions of non-controlling interest	38,543								38,543
Foreign currency translation adjustments	(30,410)				(29,944)				(466)
Changes in unrecognized pension gains (losses) and related amortization, net of tax	2,445				2,445
Changes in derivative gains (losses), net of tax	230				230
Stock awards and option exercises	5,104					1	884	4,219
Cash dividends declared on common stock	(25,078)		(25,078)
Treasury stock purchased	(28,398)						(28,398)
Ending balance at Sep. 30, 2021	$ 1,995,993		$ 1,756,820		$ (330,327)	$ 703	$ (371,896)	$ 902,601	$ 38,092