EMPLOYEE STOCK PURCHASE PLAN (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Percentage of discounted closing price for Employee Stock Purchase Plan	85.00%
Employee Stock Purchase Plan, common stock issued	98,000	101,000	136,000
Employee Stock Purchase Plan, weighted average price per share	$ 72.51	$ 61.96	$ 39.44