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Shareholders' Equity / Partners' Capital - Participating Preferred Shares (Details) - USD ($) $ in Thousands | 9 Months Ended |
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2018
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% | 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% | 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% | 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% | 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% | 6.25% |
Preferred shares, shares outstanding (in shares) | 4,600,000 |  | 4,600,000
Liquidation Value | $ 115,000 |  | $ 115,000

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