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Dividends Declared and Paid (Details) - $ / shares
3 Months Ended 9 Months Ended
Sep. 28, 2018
Aug. 31, 2018
Jul. 31, 2018
Jun. 29, 2018
May 31, 2018
Apr. 30, 2018
Mar. 29, 2018
Feb. 28, 2018
Jan. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Equity [Abstract]                              
Common shares, dividend declared per share (in dollars per share) $ 0.11 $ 0.11 $ 0.11 $ 0.11 $ 0.11 $ 0.11 $ 0.11 $ 0.11 $ 0.11 $ 0.33 $ 0.33 $ 0.33 $ 0.33 $ 0.99 $ 0.99
LTIP units, distributions per unit (in dollars per share) $ 0.11 $ 0.11 $ 0.11 $ 0.11 $ 0.11 $ 0.11 $ 0.11 $ 0.11 $ 0.11 $ 0.33 $ 0.33 $ 0.33   $ 0.99 $ 0.99