TOTAL EQUITY - Share Repurchase (Details) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2018 USD ($) $ / shares shares
Repurchases of common stock
Reduction of equity for retirement of repurchased shares	$ 21,400
Common shares
Repurchases of common stock
Repurchased and retired shares | shares	244
Weighted average market price of shares repurchased and retired (in dollars per share) | $ / shares	$ 46.77
Reduction of equity for retirement of repurchased shares	$ 11,400
Share repurchase program, period for repurchases	12 months
Authorized share repurchase capacity remaining	$ 50,000
Common shares | Maximum
Repurchases of common stock
Repurchase authorization	$ 50,000