SEGMENT AND GEOGRAPHIC REGION INFORMATION (Details 4) (USD $) In Thousands, unless otherwise specified	3 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 segment	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2013 U.S. government and agencies	Dec. 31, 2012 U.S. government and agencies	Dec. 31, 2010 U.S. government and agencies
Sales to major customers
Number of reportable segments									3
Net sales	$ 230,872	$ 216,898	$ 214,312	$ 200,586	$ 250,026	$ 219,794	$ 221,018	$ 196,662	$ 862,668	$ 887,499	$ 922,200	$ 112,300	$ 143,700	$ 180,100