SEGMENT INFORMATION (Details 2) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012
Geographical segment information
Product sales	$ 87,060	$ 82,602	$ 262,008	$ 258,448
Long-lived assets	229,669		229,669		154,384
United States
Geographical segment information
Product sales	55,616	53,936	170,195	169,937
Long-lived assets	171,232		171,232		109,950
Non-United States
Geographical segment information
Product sales	31,444	28,666	91,813	88,511
Long-lived assets	$ 58,437		$ 58,437		$ 44,434