BUSINESS SEGMENTS - Geographic Information (Details) - 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, 2016	Dec. 31, 2015	Dec. 31, 2014
Segment information [Line Items]
Property, plant and equipment, net	$ 57,133				$ 57,999				$ 57,133	$ 57,999
Net sales	40,173	$ 36,553	$ 41,317	$ 40,532	41,850	$ 39,508	$ 44,741	$ 40,819	158,575	166,918	$ 202,561
United States [Member]
Segment information [Line Items]
Property, plant and equipment, net	23,286				26,410				23,286	26,410
Net sales									78,999	81,634	91,009
Canada [Member]
Segment information [Line Items]
Property, plant and equipment, net	191				185				191	185
Net sales									16,021	13,000	23,532
United Arab Emirates [Member]
Segment information [Line Items]
Net sales									7,449	7,891	3,694
France [Member]
Segment information [Line Items]
Property, plant and equipment, net	2,168				2,490				2,168	2,490
Net sales									3,744	6,624	5,478
South Korea [Member]
Segment information [Line Items]
Net sales									1,690	5,709	7,362
Germany [Member]
Segment information [Line Items]
Property, plant and equipment, net	21,956				20,631				21,956	20,631
Net sales									5,979	5,182	7,721
Russia [Member]
Segment information [Line Items]
Property, plant and equipment, net	9,338				8,030				9,338	8,030
Net sales									3,731	4,937	7,992
India [Member]
Segment information [Line Items]
Net sales									5,066	4,566	7,617
Egypt [Member]
Segment information [Line Items]
Net sales									1,942	4,080	2,227
Spain [Member]
Segment information [Line Items]
Net sales									1,500	3,858	892
Iraq [Member]
Segment information [Line Items]
Net sales									13	3,758	11,348
China [Member]
Segment information [Line Items]
Net sales									7,012	2,426	1,800
Italy [Member]
Segment information [Line Items]
Net sales									2,577	2,327	2,350
Hong Kong [Member]
Segment information [Line Items]
Net sales									699	2,207	1,967
Sweden [Member]
Segment information [Line Items]
Net sales									2,124	1,699	1,227
Kazakhstan [Member]
Segment information [Line Items]
Property, plant and equipment, net	179				216				179	216
Rest of the world [Member]
Segment information [Line Items]
Property, plant and equipment, net	$ 15				$ 37				15	37
Net sales									$ 20,029	$ 17,020	$ 26,345