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QUARTERLY FINANCIAL DATA (UNAUDITED) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Quarterly financial data (unaudited)
Deconsolidation, Gain (Loss), Amount			$ (34,348)						$ (34,348)	$ 0	$ 0
DeconsolidationGainOrLossAmountNet			(33,251)						(33,251)
IncomeTaxSpecialItemChargeGain			(7,196)
Net sales	$ 563,828	$ 567,646	592,418	$ 550,722	$ 567,985	$ 645,166	$ 664,740	$ 657,900	2,274,614	2,535,791	2,813,324
Gross profit	197,457	199,812	202,927	189,102	196,079	198,894	225,781	220,390	789,298	841,144	949,297
Income before income taxes	78,152	80,296	45,758	73,182	71,172	(88,526)	94,434	92,707	277,388	169,787	375,813
Net income	$ 53,395	$ 60,049	$ 31,317	$ 53,638	$ 48,692	$ (60,466)	$ 70,898	$ 68,354	$ 198,399	$ 127,478	$ 254,686
Basic earnings per share (in dollars per share)	$ 0.81	$ 0.90	$ 0.46	$ 0.77	$ 0.68	$ (0.82)	$ 0.95	$ 0.90	$ 2.94	$ 1.72	$ 3.22
Diluted earnings per share (in dollars per share)	$ 0.81	$ 0.89	$ 0.45	$ 0.76	$ 0.68	$ (0.82)	$ 0.94	$ 0.89	$ 2.91	$ 1.70	$ 3.18
Rationalization and asset impairment net gains (charges)					$ (434)	$ (18,285)	$ (1,239)		$ 0	$ (19,958)	$ (30,053)
Rationalization and asset impairment net gains (charges), after-tax					(450)	(16,832)	$ (900)
Goodwill, Impairment Loss										6,315
Foreign Currency Transaction Loss, before Tax										4,334	17,665
Special items charge (Gain)									34,348	189,910	51,186
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Settlements and Curtailments					(6,407)	(136,331)			1,062	(142,738)	(1,773)
Defined Benefit Plan Recognized Net Gain (Loss) Due To Settlements Net Of Tax					(3,969)	(83,341)
Inventory Write-down										22,880	3,468
Americas Welding [Member]
Quarterly financial data (unaudited)
Net sales									1,494,982	1,741,350	1,837,670
Goodwill, Impairment Loss						6,315				0
Special items charge (Gain)						26,506			$ 0	173,239	$ 21,647
Asset Impairment Charges										$ 3,417
Inventory Write-down					$ 708
Finite-Lived Intangible Assets [Member]
Quarterly financial data (unaudited)
Asset Impairment Charges						$ 3,417

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