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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 | Dec. 31, 2018 | Sep. 30, 2018 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Class of Stock [Line Items] |  |  |  |  |  |
Reacquisition of equity component upon settlement of exchangeable senior notes |  |  |  |  |  | $ (20,098)
Net operating loss carryforward |  |  |  | $ 60,200 | $ 189,100 |
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 C Preferred Stock |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Cumulative annual cash dividend rate | 5.50% |  |  |  |  | 5.50%
Preferred stock, dividends per share, declared (in dollars per share) |  |  |  | $ 0 | 0 | $ 0.34
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% |  |
Preferred stock, dividends per share, declared (in dollars per share) |  |  |  | $ 1.47 | 1.47 | 1.47
Series G Perpetual Preferred Stock |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Cumulative annual cash dividend rate |  |  |  | 5.875% |  |
Preferred stock, dividends per share, declared (in dollars per share) |  |  |  | $ 1.47 | 1.47 | 1.47
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 | $ 1.56 | $ 0.44
Exchangeable Senior Notes |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Repayments of debt |  | $ 135,100 |  |  |  |
Extinguishment of debt |  | $ 115,000 |  |  |  |
Reacquisition of equity component upon settlement of exchangeable senior notes |  |  |  |  |  | $ 20,100

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