STOCK-BASED PLANS (Summary of Stock Option Activity) (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Weighted Average Exercise Price
Stock based compensation expense			$ 5,705,000	$ 3,407,000
Employees Directors and Consultants Stock Options
Stock Options
Stock options outstanding at the beginning of the period (in shares)			783,182
Granted (in shares)			245,500
Exercised (in shares)			(143,636)
Forfeited (in shares)			(29,500)
Stock options outstanding at the end of the period (in shares)	855,546		855,546
Weighted Average Exercise Price
Stock options outstanding at the beginning of the period (in dollars per share)			$ 90.22
Granted (in dollars per share)			125.49
Exercised (in dollars per share)			64.40
Forfeited (in dollars per share)			118.15
Stock options outstanding at the end of the period (in dollars per share)	$ 103.71		$ 103.71
Stock based compensation expense	$ 1,000,000	$ 200,000	$ 1,600,000	1,000,000
Share based compensation costs capitalized	$ 600,000	$ 0	$ 900,000	$ 300,000