EARNINGS PER COMMON SHARE (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Numerator
Net income attributable to Common Shareholders	$ 28,925	$ 16,547
Less: net income attributable to participating securities	(365)	(240)
Net income attributable to Common Shareholders, net of income attributable to participating securities	$ 28,560	$ 16,307
Denominator
Weighted average shares for basic earnings per share (in shares)	70,756	68,295
Effect of dilutive securities:
Employee Restricted Share Units and share options (in shares)	16	40
Convertible Preferred OP Units (in shares)	428	25
Denominator for diluted earnings per share (in shares)	71,200	68,360
Basic and diluted earnings per share (in dollars per share)	$ 0.40	$ 0.24