STOCK-BASED PLANS - Stock Options (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Weighted Average Exercise Price
Stock based compensation expense			$ 5,269	$ 5,940
Stock Options
Stock Options
Stock Options Outstanding at the beginning of the period (in shares)			1,046,490
Granted (in shares)			91,000
Forfeited (in shares)			(73,250)
Stock Options Outstanding at the end of the period (in shares)	1,064,240		1,064,240
Weighted Average Exercise Price
Stock Options Outstanding at the beginning of the period (in dollars per share)			$ 72.61
Granted (in dollars per share)			140.49
Forfeited (in dollars per share)			104.88
Stock Options Outstanding at the end of the period (in dollars per share)	$ 76.28		$ 76.28
Stock based compensation expense	$ 600	$ 1,100	$ 1,500	$ 3,100