SEGMENT INFORMATION (Details 2) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	Dec. 31, 2012
Geographical segment information
Product sales	$ 87,470	$ 87,471	$ 174,947	$ 175,846
Long-lived assets	164,670		164,670		154,384
United States
Geographical segment information
Product sales	57,670	57,194	114,578	116,001
Long-lived assets	122,136		122,136		109,950
Non-United States
Geographical segment information
Product sales	29,800	30,277	60,369	59,845
Long-lived assets	$ 42,534		$ 42,534		$ 44,434