EMPLOYEE STOCK PURCHASE PLAN (Details) - $ / shares	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
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	116,000	141,000	98,000
Employee Stock Purchase Plan, weighted average price per share	$ 44.76	$ 41.03	$ 72.51