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Shareholders' Equity / Partners' Capital - Participating Preferred Shares (Details) $ / shares in Units, $ in Thousands |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Apr. 05, 2018 topMarket $ / shares shares | Dec. 31, 2020 USD ($) $ / shares shares | Sep. 30, 2018 USD ($) $ / shares shares | Jun. 30, 2018 USD ($) | Dec. 31, 2020 USD ($) $ / shares shares | Dec. 31, 2019 USD ($) $ / shares shares | Dec. 31, 2018 USD ($)
Class of Stock [Line Items] |  |  |  |  |  |  |
Preferred shares, shares outstanding (in shares) | shares |  | 35,350,000 |  |  | 35,350,000 | 35,350,000 |
Current Liquidation Value |  | $ 883,750 |  |  | $ 883,750 | $ 883,750 |
Liquidation preference per share (in dollars per share) | $ / shares |  | $ 25.00 |  |  | $ 25.00 |  |
Convertible preferred stock converted to other securities |  |  |  |  | $ 0 | $ 0 | $ 32,215
Series D Perpetual Preferred Shares/Units |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Dividend Rate |  |  |  |  | 6.50% |  |
Preferred shares, shares outstanding (in shares) | shares |  | 10,750,000 |  |  | 10,750,000 | 10,750,000 |
Current Liquidation Value |  | $ 268,750 |  |  | $ 268,750 | $ 268,750 |
Series E Perpetual Preferred Stock |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Dividend Rate |  |  |  |  | 6.35% |  |
Preferred shares, shares outstanding (in shares) | shares |  | 9,200,000 |  |  | 9,200,000 | 9,200,000 |
Current Liquidation Value |  | $ 230,000 |  |  | $ 230,000 | $ 230,000 |
Series F Perpetual Preferred Stock |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Dividend Rate |  |  |  |  | 5.875% |  |
Preferred shares, shares outstanding (in shares) | shares |  | 6,200,000 |  |  | 6,200,000 | 6,200,000 |
Current Liquidation Value |  | $ 155,000 |  |  | $ 155,000 | $ 155,000 |
Series G Perpetual Preferred Stock |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Dividend Rate |  |  |  |  | 5.875% |  |
Preferred shares, shares outstanding (in shares) | shares |  | 4,600,000 |  |  | 4,600,000 | 4,600,000 |
Current Liquidation Value |  | $ 115,000 |  |  | $ 115,000 | $ 115,000 |
Series H Perpetual Preferred Stock |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Dividend Rate |  |  | 6.25% |  | 6.25% |  |
Preferred shares, shares outstanding (in shares) | shares |  | 4,600,000 |  |  | 4,600,000 | 4,600,000 |
Current Liquidation Value |  | $ 115,000 |  |  | $ 115,000 | $ 115,000 |
Liquidation preference per share (in dollars per share) | $ / shares |  |  | $ 25.00 |  |  |  |
Issuance of perpetual preferred shares, net of offering costs (in shares) | shares |  |  | 4,600,000 |  |  |  |
Gross proceeds under issuance of preferred shares |  |  | $ 115,000 |  |  |  |
Offering costs |  |  | $ 4,400 |  |  |  |
Series C Preferred Stock |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Dividend Rate | 5.50% |  |  |  |  |  | 5.50%
Liquidation preference per share (in dollars per share) | $ / shares | $ 25.00 |  |  |  |  |  |
Stock issued during period, shares, conversion of convertible securities (in shares) | shares | 7,600,000 |  |  |  |  |  |
Class A Common Shares/units |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Issuance of perpetual preferred shares, net of offering costs (in shares) | shares |  | 14,950,000 |  |  |  |  |
Offering costs |  | $ 200 |  |  | $ 600 | $ 0 | $ 0
Stated value per share (in dollars per share) | $ / shares | $ 0.01 | $ 0.01 |  |  | $ 0.01 | $ 0.01 |
Repurchase of class A units (in shares) | shares | 10,848,827 |  |  |  |  |  |
Stock exchange ratio | 1.4275 |  |  |  |  |  |
Percent of cumulative change in value of an index | 50.00% |  |  |  |  |  |
Number of markets used in calculation | topMarket | 20 |  |  |  |  |  |
Maximum internal rate of return | 9.00% |  |  |  |  |  |
Convertible preferred stock converted to other securities |  |  |  | $ 32,200 |  |  |

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