Consolidated Statement of Equity (Parenthetical) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Sep. 30, 2017	Mar. 31, 2017	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Class A common shares/units
Offering costs	$ 9,200	$ 400	$ 0	$ 0	$ 10,637
Common Stock
Dividends declared on common shares (in dollars per unit)			$ 0.2	$ 0.2	$ 0.20
Common Stock | Class A common shares/units
Offering costs					$ 10,904
Preferred shares
Offering costs				$ 4,022	$ 9,355