ACCOUNTS RECEIVABLE, NET (Details 2) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Changes in the allowance for doubtful accounts, net of recoveries
Balance at the beginning of the period	$ 2,047	$ 2,132	$ 696
Bad debt expense	3,049	967	1,735
Recoveries	(21)	(54)	(106)
Write-offs	(1,801)	(998)	(193)
Balance at the end of the period	$ 3,274	$ 2,047	$ 2,132