Adjustment to additional paid in capital resulting from the recognition of convertible debt instruments as two separate components - a debt component and an equity component. This bifurcation may result in a basis difference associated with the liability component that represents a temporary difference for purposes of applying accounting for income taxes. The initial recognition of deferred taxes for the tax effect of that temporary difference is as an adjustment to additional paid in capital.

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Shareholders' Equity / Partners' Capital - Exchangeable Senior Notes and Distributions (Details) - USD ($) $ / shares in Units, $ in Thousands			3 Months Ended				12 Months Ended
	Apr. 05, 2018	Oct. 03, 2017	Dec. 31, 2018	Sep. 30, 2018	Sep. 30, 2017	Jun. 30, 2017	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Class of Stock [Line Items]
Reacquisition of equity component upon settlement of exchangeable senior notes								$ (20,098)
Net operating loss carryforward			$ 275,000				$ 188,800	$ 275,000
Class A and B common shares/units
Class of Stock [Line Items]
Dividends declared on common shares (in dollars per unit)							$ 0.20	$ 0.20	$ 0.20
Series A Participating Preferred Stock
Class of Stock [Line Items]
Cumulative annual cash dividend rate		5.00%					5.00%		5.00%
Preferred stock, dividends per share, declared (in dollars per share)							$ 0	0	$ 0.94
Series B Participating Preferred Stock
Class of Stock [Line Items]
Cumulative annual cash dividend rate		5.00%					5.00%		5.00%
Preferred stock, dividends per share, declared (in dollars per share)							$ 0	$ 0	$ 0.94
Series C Preferred Stock
Class of Stock [Line Items]
Cumulative annual cash dividend rate	5.50%						5.50%	5.50%
Preferred stock, dividends per share, declared (in dollars per share)							$ 0	$ 0.34	1.38
Series D Perpetual Preferred Shares/Units
Class of Stock [Line Items]
Cumulative annual cash dividend rate							6.50%
Preferred stock, dividends per share, declared (in dollars per share)							$ 1.63	1.63	1.63
Series E Perpetual Preferred Stock
Class of Stock [Line Items]
Cumulative annual cash dividend rate							6.35%
Preferred stock, dividends per share, declared (in dollars per share)							$ 1.59	1.59	1.59
Series F Perpetual Preferred Stock
Class of Stock [Line Items]
Cumulative annual cash dividend rate						5.875%	5.875%
Preferred stock, dividends per share, declared (in dollars per share)							$ 1.47	1.47	1.01
Series G Perpetual Preferred Stock
Class of Stock [Line Items]
Cumulative annual cash dividend rate					5.875%		5.875%
Preferred stock, dividends per share, declared (in dollars per share)							$ 1.47	1.47	0.67
Series H Perpetual Preferred Stock
Class of Stock [Line Items]
Cumulative annual cash dividend rate				6.25%			6.25%
Preferred stock, dividends per share, declared (in dollars per share)							$ 1.56	$ 0.44	$ 0
Exchangeable senior notes
Class of Stock [Line Items]
Repayments of debt			135,100
Reacquisition of equity component upon settlement of exchangeable senior notes								$ 20,100
Extinguishment of debt			$ 115,000