STOCK-BASED COMPENSATION (Analysis of Stock Options Award Activity) (Details) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2018 USD ($) $ / shares shares	Dec. 31, 2017 USD ($) $ / shares shares	Dec. 31, 2016 USD ($)
Shares
Outstanding at beginning of period (in shares) | shares	1,101,051
Granted (in shares) | shares	85,517
Exercised (in shares) | shares	(267,399)
Forfeited (in shares) | shares	20,266
Expired (in shares) | shares	(1,000)
Outstanding at end of period (in shares) | shares	897,903	1,101,051
Exercisable at end of period (in shares) | shares	458,465
Weighted-Average Exercise Price
Outstanding at beginning of period (in dollars per share) | $ / shares	$ 31.16
Granted (in dollars per share) | $ / shares	45.03
Exercised (in dollars per share) | $ / shares	28.30
Forfeited (in dollars per share) | $ / shares	35.27
Expired (in dollars per share) | $ / shares	34.39
Outstanding at end of period (in dollars per share) | $ / shares	33.24	$ 31.16
Exercisable at end of period (in dollars per share) | $ / shares	$ 28.92
Outstanding at end of period, weighted-average remaining life	6 years 2 months 12 days
Exercisable at end of period, weighted-average remaining life	5 years 1 month 2 days
Outstanding at end of period, aggregate intrinsic value | $	$ 19,944
Exercisable at end of period, aggregate intrinsic value | $	12,162
Intrinsic value of options exercised | $	$ 5,850	$ 3,159	$ 4,339