Consolidated Statements of Equity (Parenthetical) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
Statement of Stockholders' Equity [Abstract]
Issuance of shares, offering costs	$ 2,001	$ 461
Common shares, dividend declared per share (in dollars per share)	$ 0.6	$ 0.45
LTIP units, distributions per unit (in dollars per share)	$ 0.6	$ 0.45