Shareholders' Equity / Partners' Capital - Participating Preferred Shares (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Dec. 31, 2019
Class of Stock [Line Items]
Preferred shares, shares outstanding (in shares)	35,350,000	35,350,000
Liquidation Value	$ 883,750	$ 883,750
Series D Perpetual Preferred Shares/Units
Class of Stock [Line Items]
Preferred stock, dividend rate, percentage	6.50%
Preferred shares, shares outstanding (in shares)	10,750,000	10,750,000
Liquidation Value	$ 268,750	$ 268,750
Series E Perpetual Preferred Shares
Class of Stock [Line Items]
Preferred stock, dividend rate, percentage	6.35%
Preferred shares, shares outstanding (in shares)	9,200,000	9,200,000
Liquidation Value	$ 230,000	$ 230,000
Series F Perpetual Preferred Shares
Class of Stock [Line Items]
Preferred stock, dividend rate, percentage	5.875%
Preferred shares, shares outstanding (in shares)	6,200,000	6,200,000
Liquidation Value	$ 155,000	$ 155,000
Series G Perpetual Preferred Shares
Class of Stock [Line Items]
Preferred stock, dividend rate, percentage	5.875%
Preferred shares, shares outstanding (in shares)	4,600,000	4,600,000
Liquidation Value	$ 115,000	$ 115,000
Series H Perpetual Preferred Shares
Class of Stock [Line Items]
Preferred stock, dividend rate, percentage	6.25%
Preferred shares, shares outstanding (in shares)	4,600,000	4,600,000
Liquidation Value	$ 115,000	$ 115,000