SEGMENT INFORMATION (Details 2) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014		Mar. 31, 2013		Dec. 31, 2013
Geographical segment information
Product sales	$ 89,978		$ 87,478
Long-lived assets	234,170				235,920
United States
Geographical segment information
Product sales	56,773		56,908
Long-lived assets	171,716				172,360
Non-United States
Geographical segment information
Product sales	33,205	[1]	30,570	[1]
Long-lived assets	$ 62,454	[1]			$ 63,560	[1]

[1] No additional locations are individually significant.