STOCK-BASED PLANS (Summary of Stock Option Activity) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Weighted Average Exercise Price
Stock based compensation expense			$ 4,670	$ 3,232
Stock Options
Stock Options
Share based compensation costs capitalized	$ 200	$ 600	$ 800	1,100
Stock options outstanding at the beginning of the period (in shares)			1,086,040
Granted (in shares)			136,500
Forfeited (in shares)			(33,000)
Stock options outstanding at the end of the period (in shares)	1,189,540		1,189,540
Weighted Average Exercise Price
Stock options outstanding at the beginning of the period (in dollars per share)			$ 77.11
Granted (in dollars per share)			108.64
Forfeited (in dollars per share)			118.23
Stock options outstanding at the end of the period (in dollars per share)	$ 79.55		$ 79.55
Stock based compensation expense	$ 500	$ 1,200	$ 2,300	$ 1,800