BUSINESS SEGMENTS - Geographic Information (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Segment information [Line Items]
Property, plant and equipment, net	$ 57,999				$ 63,835				$ 57,999	$ 63,835
Net sales	41,850	$ 39,508	$ 44,741	$ 40,819	51,995	$ 51,886	$ 51,911	$ 46,769	166,918	202,561	$ 202,060
United States [Member]
Segment information [Line Items]
Property, plant and equipment, net	26,410				26,291				26,410	26,291
Net sales									81,634	91,009	88,532
Canada [Member]
Segment information [Line Items]
Property, plant and equipment, net	185				1,655				185	1,655
Net sales									13,000	23,532	18,142
United Arab Emirates [Member]
Segment information [Line Items]
Net sales									7,891	3,694	2,695
France [Member]
Segment information [Line Items]
Property, plant and equipment, net	2,490				4,440				2,490	4,440
Net sales									6,624	5,478	3,756
South Korea [Member]
Segment information [Line Items]
Net sales									5,709	7,362	11,642
Germany [Member]
Segment information [Line Items]
Property, plant and equipment, net	20,631				21,210				20,631	21,210
Net sales									5,182	7,721	9,208
Russia [Member]
Segment information [Line Items]
Property, plant and equipment, net	8,030				9,556				8,030	9,556
Net sales									4,937	7,992	5,992
India [Member]
Segment information [Line Items]
Net sales									4,566	7,617	8,888
Egypt [Member]
Segment information [Line Items]
Net sales									4,080	2,227	2,133
Spain [Member]
Segment information [Line Items]
Net sales									3,858	892	5,775
Iraq [Member]
Segment information [Line Items]
Net sales									3,758	11,348	4,243
China [Member]
Segment information [Line Items]
Net sales									2,426	1,800	606
Italy [Member]
Segment information [Line Items]
Net sales									2,327	2,350	4,119
Hong Kong [Member]
Segment information [Line Items]
Net sales									2,207	1,967	1,180
Sweden [Member]
Segment information [Line Items]
Net sales									1,699	1,227	1,547
Kazakhstan [Member]
Segment information [Line Items]
Property, plant and equipment, net	216				461				216	461
Rest of the world [Member]
Segment information [Line Items]
Property, plant and equipment, net	$ 37				$ 222				37	222
Net sales									$ 17,020	$ 26,345	$ 33,602