ACQUISITIONS (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended				12 Months Ended								1 Months Ended	12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Nov. 30, 2013	Dec. 31, 2013 2013 Acquisitions [Member]	Dec. 31, 2012 Tennessee Rand, Inc.	Nov. 12, 2012 Kaliburn	Apr. 30, 2012 Wayne Trail Technologies Inc.	Dec. 31, 2011 Weartech International Inc.	Jun. 30, 2011 Techalloy	Jun. 30, 2011 Torchmate	Dec. 31, 2010 OOO Severstal-metiz	Jan. 31, 2011 SSCO Manufacturing, Inc. (d/b/a Arc Products)	Dec. 31, 2013 SSCO Manufacturing, Inc. (d/b/a Arc Products)	Dec. 31, 2010 SSCO Manufacturing, Inc. (d/b/a Arc Products)
Acquisitions
Consideration paid in cash and assumed debt									$ 54,023	$ 144,423	$ 65,321
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value												17,225
Fair value of assets acquired	30,051				73,257				30,051	73,257	46,837
Goodwill from acquisition									41,197	71,166	22,290
Annual sales at the date of acquisition	714,791	691,875	727,432	718,573	684,648	697,552	744,045	727,122	2,852,671	2,853,367	2,694,609		35,000	35,000	36,000	50,000	40,000	70,000	13,000
Sales for last annual period																				40,000
Contingent consideration																					$ 3,806	$ 5,375
Period of estimated sales as basis for contingent consideration (in years)									3 years												5 years	5 years
Sales for prior annual period																							not significant