STOCK-BASED COMPENSATION (Employee Stock Purchase Plan) (Details) (Employee Stock Purchase Plan, USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 1999
Stock-based compensation
Number of shares authorized (in shares)				1,600,000
Employee stock purchase plan purchase price of a share of common stock purchased equal to the lower of the beginning-of-quarter or end-of-quarter market price (as a percent)	85.00%
Number of shares available for grant (in shares)	700,000
Stock-based Compensation Employee Stock Purchase Plan Fair Value Assumptions and Methodology
Expected option life (in months)	3 months	3 months	3 months
Risk free interest rates, minimum (as a percent)	0.02%	0.02%	0.02%
Risk free interest rate, maximum (as a percent)	0.08%	0.10%	0.15%
Estimated volatility (as a percent)	42.00%	46.00%	59.00%
Dividend yield (as a percent)	0.00%	0.00%	0.00%
Weighted average fair market value of purchase rights granted (in dollars per share)	$ 1.29	$ 2.43	$ 5.00
Minimum
Stock-based compensation
Employee stock purchase plan work week requirement to participate in plan (in hours per week)	20 hours
Employee stock purchase plan months required to work to be able participate in plan (in months)	5 months
Employee stock purchase plan participants are temporarily restricted from selling the shares of common stock purchased (in months)	6 months
Maximum
Stock-based compensation
Employee stock purchase plan maximum annual base earnings withheld to purchase shares of common stock (as a percent)	15.00%
Employee stock purchase plan maximum annual base earnings withheld to purchase shares of common stock amount per calendar year (in dollars)	$ 25,000