EARNINGS PER COMMON SHARE (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Numerator
Net income attributable to Common Shareholders	$ 17,918	$ 26,495	$ 46,843	$ 43,042
Less: net income attributable to participating securities	(223)	(377)	(589)	(615)
Net income attributable to Common Shareholders, net of income attributable to participating securities	$ 17,695	$ 26,118	$ 46,254	$ 42,427
Denominator
Weighted average shares for basic earnings per share (in shares)	72,896	68,825	71,826	68,561
Effect of dilutive securities:
Employee Restricted Share Units and share options (in shares)	0	19	0	30
Convertible Preferred OP Units (in shares)	0	25	25	25
Denominator for diluted earnings per share (in shares)	72,896	68,869	71,851	68,616
Basic and diluted earnings per share (in dollars per share)	$ 0.24	$ 0.38	$ 0.64	$ 0.62