STOCK-BASED PLANS (Summary of Stock Option Activity) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Weighted Average Exercise Price
Stock based compensation costs			$ 6,324	$ 5,269
Stock Options
Stock Options
Share based compensation costs capitalized	$ 300	$ 600	$ 1,100	1,500
Stock options outstanding at the beginning of the period (in shares)			1,086,040
Granted (in shares)			146,000
Exercised (in shares)			(3,000)
Forfeited (in shares)			(51,000)
Stock options outstanding at the end of the period (in shares)	1,178,040		1,178,040
Weighted Average Exercise Price
Stock options outstanding at the beginning of the period (in dollars per share)			$ 77.11
Granted (in dollars per share)			108.93
Exercised (in dollars per share)			60.33
Forfeited (in dollars per share)			125.62
Stock options outstanding at the end of the period (in dollars per share)	$ 78.96		$ 78.96
Stock based compensation costs	$ 1,200	$ 1,200	$ 3,500	$ 2,900