CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY (Unaudited) - 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)	97,110		97,092						18
Foreign currency translation adjustments	(23,133)				(23,134)				1
Changes in unrecognized pension gains (losses) and related amortization, net of tax	3,076				3,076
Changes in derivative gains (losses), net of tax	750				750
Stock awards and option exercises	43,451					4	10,532	32,915
Cash dividends declared on common stock	(46,143)		(46,143)
Ending balance at Jun. 30, 2020	1,645,986		1,573,392		(361,256)	690	(370,706)	803,511	355
Beginning balance at Mar. 31, 2020	1,587,623		1,554,665		(381,058)	689	(372,573)	785,567	333
Increase (Decrease) in Stockholders' Equity
Net income (loss)	41,860		41,839						21
Foreign currency translation adjustments	19,096				19,095				1
Changes in unrecognized pension gains (losses) and related amortization, net of tax	1,440				1,440
Changes in derivative gains (losses), net of tax	(733)				(733)
Stock awards and option exercises	19,812					1	1,867	17,944
Cash dividends declared on common stock	(23,112)		(23,112)
Ending balance at Jun. 30, 2020	1,645,986		1,573,392		(361,256)	690	(370,706)	803,511	355
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)	139,213		139,228						(15)
Foreign currency translation adjustments	(27,373)				(27,373)
Changes in unrecognized pension gains (losses) and related amortization, net of tax	5,215				5,215
Changes in derivative gains (losses), net of tax	809				809
Stock awards and option exercises	66,429					7	17,201	49,221
Cash dividends declared on common stock	(48,415)		(48,415)
Ending balance at Jun. 30, 2021	1,986,663		1,734,638		(303,058)	702	(344,382)	898,382	381
Beginning balance at Mar. 31, 2021	1,900,795		1,704,336		(326,965)	700	(352,282)	874,623	383
Increase (Decrease) in Stockholders' Equity
Net income (loss)	55,274		55,276						(2)
Foreign currency translation adjustments	21,109				21,109
Changes in unrecognized pension gains (losses) and related amortization, net of tax	2,509				2,509
Changes in derivative gains (losses), net of tax	289				289
Stock awards and option exercises	31,661					2	7,900	23,759
Cash dividends declared on common stock	(24,974)		(24,974)
Ending balance at Jun. 30, 2021	$ 1,986,663		$ 1,734,638		$ (303,058)	$ 702	$ (344,382)	$ 898,382	$ 381