STOCK-BASED PLANS (Summary of Stock Option Activity) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Weighted Average Exercise Price
Stock based compensation expense	$ 1,906	$ 2,722
Employees Directors and Consultants Stock Options [Member]
Stock Options
Share based compensation costs capitalized	$ 300	600
Stock options outstanding at the beginning of the period (in shares)	1,176,640
Granted (in shares)	30,000
Exercised (in shares)	(227,847)
Forfeited (in shares)	(27,500)
Stock options outstanding at the end of the period (in shares)	951,293
Weighted Average Exercise Price
Stock options outstanding at the beginning of the period (in dollars per share)	$ 78.87
Granted (in dollars per share)	116.58
Exercised (in dollars per share)	58.36
Forfeited (in dollars per share)	79.53
Stock options outstanding at the end of the period (in dollars per share)	$ 84.95
Stock based compensation expense	$ 800	$ 1,600