EQUITY - Treasury Stock (Details) - $ / shares	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Treasury Stock
Repurchase of common stock (in shares)			5,564
Average cost of repurchase (in dollars per share)			$ 56.20
Number of options exercised via net share settlement			84,444
Dvidends
Dividends paid per share (in dollars per share)	$ 0.18	$ 0.18	$ 0.54	$ 0.54