SEGMENT AND GEOGRAPHIC REGION INFORMATION (Details 3) - USD ($) $ 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, 2017	Dec. 31, 2016	Dec. 31, 2015
Sales to clients attributed to the geographic areas based on the origin of sale
Sales	$ 316,122	$ 291,256	$ 268,694	$ 256,820	$ 292,866	$ 292,097	$ 294,700	$ 284,629	$ 1,132,892	$ 1,164,292	$ 1,104,442
Property, plant, and equipment, net	197,084				172,142				200,630	197,084	172,142
United States
Sales to clients attributed to the geographic areas based on the origin of sale
Sales									977,669	1,031,920	979,221
Property, plant, and equipment, net	157,856				137,863				157,805	157,856	137,863
Canada
Sales to clients attributed to the geographic areas based on the origin of sale
Sales									52,894	36,813	36,163
Property, plant, and equipment, net	26,452				20,919				29,307	26,452	20,919
Europe
Sales to clients attributed to the geographic areas based on the origin of sale
Sales									100,233	93,420	89,058
Property, plant, and equipment, net	12,776				13,360				13,518	12,776	13,360
Mexico
Sales to clients attributed to the geographic areas based on the origin of sale
Sales									2,096	2,139	0
Property, plant, and equipment, net	$ 0				$ 0				$ 0	$ 0	$ 0