STOCK-BASED PLANS (Summary of Restricted Stock 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 Grant Date Fair Value
Stock based compensation costs			$ 6,324	$ 5,269
Restricted Stock
Restricted stock activity
Restricted stock outstanding at the beginning of the period (in shares)			242,556
Granted (in shares)			136,198
Vested (in shares)			(37,670)
Forfeited (in shares)			(4,985)
Restricted stock outstanding at the end of the period (in shares)	336,099		336,099
Weighted Average Grant Date Fair Value
Restricted stock outstanding at the beginning of the period (in dollars per share)			$ 100.15
Granted (in dollars per share)			67.80
Vested (in dollars per share)			83.47
Forfeited (in dollars per share)			86.48
Restricted stock outstanding at the end of the period (in dollars per share)	$ 89.11		$ 89.11
Stock based compensation costs	$ 1,200	$ 1,500	$ 4,400	4,000
Share based compensation costs capitalized	$ 300	$ 200	$ 900	$ 600