Summary of Significant Accounting Policies - Dividends and Distributions (Details) - $ / shares		3 Months Ended		9 Months Ended
	Sep. 21, 2017	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Accounting Policies [Abstract]
Dividends and distributions declared per common share and OP Unit (in dollars per share)	$ 0.23	$ 0.230	$ 0.225	$ 0.685	$ 0.675
Cash dividend distributed to common shareholders (in dollars per share)	$ 0.23