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PRODUCT WARRANTY COSTS (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Changes in the carrying amount of product warranty accruals
Balance at beginning of year		$ 21,053	$ 19,469	$ 15,579
Accruals for warranties		9,901	13,058	19,824
Settlements		(11,500)	(11,434)	(15,458)
Standard And Extended Product Warranty Accrual Foreign Currency Translation Gain (Loss) and Other Adjustments	[1]	2,575	(40)	(476)
Balance at end of year		22,029	$ 21,053	$ 19,469
Air Liquide Welding [Member]
Changes in the carrying amount of product warranty accruals
Product Warranty Accrual Additions From Business Acquisition		$ 2,299
[1] At December 31, 2017, Foreign currency translation and other adjustments includes $2,299 in an acquired liability related to the Air Liquide Welding acquisition as discussed in Note 3 to the consolidated financial statements.

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Amount of foreign currency translation gain (loss) and other adjustments which decreases (increases) the standard and extended product warranty accrual.

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Carrying value as of the balance sheet date of obligations incurred through that date and payable for estimated claims under standard and extended warranty protection rights granted to customers.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Amount of decrease in the standard and extended product warranty accrual from payments made in cash or in kind to satisfy claims under the terms of the standard and extended product warranty.

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Amount of increase in the standard and extended product warranty accrual from warranties issued.

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