BUSINESS SEGMENTS (Details 2) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Segment information
Property, plant and equipment, net	$ 53,976				$ 41,402				$ 53,976	$ 41,402	$ 39,806
NET SALES	52,519	50,149	48,687	50,212	54,262	54,890	54,165	45,574	201,567	208,891	154,739
United States
Segment information
Property, plant and equipment, net	28,248				21,810				28,248	21,810	20,784
NET SALES									78,676	81,410	44,587
Germany
Segment information
Property, plant and equipment, net	11,319				9,924				11,319	9,924	9,234
NET SALES									13,992	12,960	25,109
France
Segment information
Property, plant and equipment, net	5,912				5,767				5,912	5,767	5,742
NET SALES									6,838	3,828	5,425
Canada
Segment information
Property, plant and equipment, net	2,136				2,339				2,136	2,339	2,145
NET SALES									21,083	24,151	29,907
Rest of the world
Segment information
Property, plant and equipment, net	1,010				1,175				1,010	1,175	1,570
NET SALES									57,051	46,465	30,538
South Korea
Segment information
NET SALES									9,469	29,951	10,309
Russia
Segment information
Property, plant and equipment, net	5,351				387				5,351	387	331
NET SALES									6,472	8,658	7,067
China
Segment information
NET SALES									$ 7,986	$ 1,468	$ 1,797