EQUITY - Stock Options (Details)	3 Months Ended
	Mar. 31, 2017 $ / shares shares
Shares
Exercised (in shares) | shares	(21,327)
Weighted Average Exercise Price
Exercised (in dollars per share) | $ / shares	$ 28.73
Stock options
Shares
Outstanding at the beginning of the period (in shares) | shares	446,498
Granted (in shares) | shares	34,600
Exercised (in shares) | shares	(21,327)
Cancelled, expired or forfeited (in shares) | shares	(4,446)
Outstanding at the end of the period (in shares) | shares	455,325
Exercisable at the end of the period (in shares) | shares	253,615
Weighted Average Exercise Price
Outstanding at the beginning of the period (in dollars per share) | $ / shares	$ 36.49
Granted (in dollars per share) | $ / shares	49.15
Exercised (in dollars per share) | $ / shares	28.73
Cancelled, expired or forfeited (in dollars per share) | $ / shares	42.10
Outstanding at the end of the period (in dollars per share) | $ / shares	37.76
Exercisable at the end of the period (in dollars per share) | $ / shares	$ 35.87