ACCOUNTS RECEIVABLE, NET (Details 2) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Changes in the allowance for doubtful accounts, net of recoveries
Balance at the beginning of the period	$ 3,274	$ 2,047	$ 2,132
Bad debt expense	2,549	3,049	967
Recoveries	(21)	(21)	(54)
Write-offs	(171)	(1,801)	(998)
Balance at the end of the period	$ 5,631	$ 3,274	$ 2,047