SEGMENT INFORMATION (Details 2) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012
Geographical segment information
Product sales	$ 87,478	$ 88,375
Long-lived assets	162,335		154,384
United States
Geographical segment information
Product sales	56,908	58,807
Long-lived assets	119,322		109,950
Non-United States
Geographical segment information
Product sales	30,570	29,568
Other
Geographical segment information
Long-lived assets	$ 43,013		$ 44,434