SUMMARY OF STOCK OPTIONS UNDER ALL PLANS (Details) - Stock Options - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Total Options
Outstanding at the beginning of the period (in shares)	746,533
Granted (in shares)	50,815
Exercised (in shares)	(80,183)
Forfeited (in shares)	(29,082)
Outstanding at the end of the period (in shares)	688,083	746,533
Exercisable at the end of the period (in shares)	394,997
Weighted Average Exercise Price
Outstanding at the beginning of the period (in dollars per share)	$ 26.19
Granted (in dollars per share)	41.10
Exercised (in dollars per share)	21.75
Forfeited (in dollars per share)	27.92
Outstanding at the end of the period (in dollars per share)	27.75	$ 26.19
Exercisable at the end of the period (in dollars per share)	$ 23.44
Weighted Average Remaining Contractual Term (In Years)
Outstanding at the end of the period	5 years 4 months 24 days
Exercisable at the end of the period	4 years 2 months 12 days
Aggregate Intrinsic Value
Outstanding at beginning of period	$ 15,505
Exercised	1,970	$ 13,900	$ 44,600
Outstanding at the end of the period	4,187	$ 15,505
Exercisable at the end of the period	$ 3,656