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Consolidated Statements of Equity (Parenthetical) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Statement of Stockholders' Equity [Abstract]      
Issuance of shares, offering costs $ 518 $ 2,149 $ 75
Common shares, dividend declared per share (in dollars per share) $ 1.32 $ 1.32 $ 1.30
LTIP units, distributions per unit (in dollars per share) $ 1.32 $ 1.32 $ 1.30