Equity - Exchangeable Shares and Preferred Stock (Details)	3 Months Ended
	Mar. 31, 2019 Acquisition shares	Dec. 31, 2018 shares	Oct. 05, 2017 shares
Class of Stock [Line Items]
Number of shares of common stock received for each exchangeable share (in shares)	1
Minimum number of shares that can be exchanged by exchangeable shareholders unless the number of remaining exchangeable shares registered in the name of the holder is less (in shares)	50,000
Number of business acquisitions having issuances of preferred stock | Acquisition	2
Series F Preferred Stock
Class of Stock [Line Items]
Preferred stock, shares issued (in shares)			1
Series G Preferred Stock
Class of Stock [Line Items]
Preferred stock, shares issued (in shares)	0	1	1
Exchangeable Shares For Common Stock
Class of Stock [Line Items]
Exchangeable shares exchanged for common stock (in shares)	400,000
Exchangeable Shares
Class of Stock [Line Items]
Common stock, shares outstanding (in shares)	36,183	486,112