SEGMENT INFORMATION (Details 2) (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		Dec. 31, 2012		Dec. 31, 2011
Geographical segment information
Product sales	$ 96,556	$ 87,060	$ 87,470	$ 87,478	$ 92,223	$ 82,602	$ 87,471	$ 88,375	$ 358,564		$ 350,671		$ 338,319
Long-lived assets	235,920				154,384				235,920		154,384
United States
Geographical segment information
Product sales									231,880		228,883		221,988
Long-lived assets	172,360				109,950				172,360		109,950
Non-United States
Geographical segment information
Product sales									126,684	[1]	121,788	[1]	116,331	[1]
Long-lived assets	$ 63,560				$ 44,434				$ 63,560		$ 44,434

[1] No additional locations are individually significant.