EQUITY - Stock Options (Details)	6 Months Ended
	Jun. 30, 2017 $ / shares shares
Shares
Exercised (in shares) | shares	(26,185)
Weighted Average Exercise Price
Exercised (in dollars per share) | $ / shares	$ 30.45
Stock options
Shares
Outstanding at the beginning of the period (in shares) | shares	446,498
Granted (in shares) | shares	38,087
Exercised (in shares) | shares	(26,185)
Cancelled, expired or forfeited (in shares) | shares	(5,656)
Outstanding at the end of the period (in shares) | shares	452,744
Exercisable at the end of the period (in shares) | shares	248,886
Weighted Average Exercise Price
Outstanding at the beginning of the period (in dollars per share) | $ / shares	$ 36.49
Granted (in dollars per share) | $ / shares	49.27
Exercised (in dollars per share) | $ / shares	30.45
Cancelled, expired or forfeited (in dollars per share) | $ / shares	41.46
Outstanding at the end of the period (in dollars per share) | $ / shares	37.86
Exercisable at the end of the period (in dollars per share) | $ / shares	$ 35.84