EQUITY - Treasury Stock (Details)	6 Months Ended
	Jun. 30, 2017 $ / shares shares
Treasury Stock
Repurchase of common stock (in shares)	1,613
Average cost of repurchase (in dollars per share) | $ / shares	$ 48.57
Number of options exercised (in shares)	26,185
Weighted-average exercise price of options exercised (in dollars per share) | $ / shares	$ 30.45
Number of options exercised via net share settlement	3,778
Stock options
Treasury Stock
Number of options exercised (in shares)	26,185
Weighted-average exercise price of options exercised (in dollars per share) | $ / shares	$ 30.45