INCOME TAXES - Activity in Valuation Allowance (Details) - Deferred tax asset valuation allowance - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Valuation allowance activities
Balance at beginning of year	$ 1,259	$ 1,000	$ 1,374
Generated	5,365	665	26
Released	(932)	(406)	(400)
Balance at end of year	$ 5,692	$ 1,259	$ 1,000