OTHER (EXPENSE) INCOME, NET (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012 item	Dec. 31, 2011	Dec. 31, 2010
OTHER (EXPENSE) INCOME, NET
Equity in losses of and impairment loss on investment in affiliate	$ (1,741)	$ (530)
Interest income	222	32	31
Change in fair value of put option		732	557
Other, net	(69)	54	335
Total other (expense) income, net	$ (1,588)	$ 288	$ 923
Number of put option agreements	3