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Shareholders' Equity / Partners' Capital - Participating Preferred Shares (Details) $ / shares in Units, $ in Thousands |  |  | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Apr. 05, 2018 shares | Oct. 03, 2017 shares | Sep. 30, 2018 USD ($) $ / shares shares | Mar. 31, 2018 USD ($) shares | Sep. 30, 2017 USD ($) $ / shares shares | Jun. 30, 2017 USD ($) $ / shares shares | Mar. 31, 2017 shares | Jun. 30, 2016 USD ($) shares | Jun. 30, 2014 USD ($) shares | Dec. 31, 2013 USD ($) shares | Mar. 31, 2014 USD ($) shares | Dec. 31, 2018 USD ($) market $ / shares shares | Dec. 31, 2017 USD ($) shares | Dec. 31, 2016 USD ($)
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred shares, shares outstanding (in shares) | shares |  |  |  |  |  |  |  |  |  |  |  | 35,350,000 | 38,350,000 |
Current Liquidation Value |  |  |  |  |  |  |  |  |  |  |  | $ 883,750 | $ 986,986 |
Liquidation preference per share (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  |  |  |  | $ 25.00 |  |
Number of top markets used for purchase price index | market |  |  |  |  |  |  |  |  |  |  |  | 20 |  |
Dividend rate, percentage cap |  |  |  |  |  |  |  |  |  |  |  | 9.00% |  |
Series C Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cumulative annual cash dividend rate |  |  |  |  |  |  |  |  | 5.50% |  |  | 5.50% | 5.50% | 5.50%
Preferred shares, shares outstanding (in shares) | shares |  |  |  |  |  |  |  |  |  |  |  | 0 | 7,600,000 |
Current Liquidation Value |  |  |  |  |  |  |  |  |  |  |  | $ 0 | $ 218,236 |
Liquidation preference per share (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  |  |  |  | $ 25 |  |
Preferred units issued (in shares) | shares |  |  |  |  |  |  |  |  | 7,600,000 |  |  |  |  |
Gross proceeds from issuance of Preferred shares before offering costs |  |  |  |  |  |  |  |  | $ 190,000 |  |  |  |  |
Offering costs |  |  |  |  |  |  |  |  | $ 9,700 |  |  |  |  |
Series D Perpetual Preferred Shares/Units |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cumulative annual cash dividend rate |  |  |  |  |  |  |  | 6.50% |  |  |  | 6.50% |  |
Preferred shares, shares outstanding (in shares) | shares |  |  |  |  |  |  |  |  |  |  |  | 10,750,000 | 10,750,000 |
Current Liquidation Value |  |  |  |  |  |  |  |  |  |  |  | $ 268,750 | $ 268,750 |
Issuance of perpetual preferred shares, net of offering costs (in shares) | shares |  |  |  |  |  |  |  | 10,750,000 |  |  |  |  |  |
Gross proceeds under issuance of preferred shares |  |  |  |  |  |  |  | $ 268,800 |  |  |  |  |  |
Offering costs |  |  |  |  |  |  |  | $ 8,500 |  |  |  |  |  |
Series E Perpetual Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cumulative annual cash dividend rate |  |  |  |  |  |  |  | 6.35% |  |  |  | 6.35% |  |
Preferred shares, shares outstanding (in shares) | shares |  |  |  |  |  |  |  |  |  |  |  | 9,200,000 | 9,200,000 |
Current Liquidation Value |  |  |  |  |  |  |  |  |  |  |  | $ 230,000 | $ 230,000 |
Issuance of perpetual preferred shares, net of offering costs (in shares) | shares |  |  |  |  |  |  |  | 9,200,000 |  |  |  |  |  |
Gross proceeds under issuance of preferred shares |  |  |  |  |  |  |  | $ 230,000 |  |  |  |  |  |
Offering costs |  |  |  |  |  |  |  | $ 7,500 |  |  |  |  |  |
Series F Perpetual Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cumulative annual cash dividend rate |  |  |  |  |  | 5.875% |  |  |  |  |  | 5.875% |  |
Preferred shares, shares outstanding (in shares) | shares |  |  |  |  |  |  |  |  |  |  |  | 6,200,000 | 6,200,000 |
Current Liquidation Value |  |  |  |  |  |  |  |  |  |  |  | $ 155,000 | $ 155,000 |
Liquidation preference per share (in dollars per share) | $ / shares |  |  |  |  |  | $ 25.00 |  |  |  |  |  |  |  |
Issuance of perpetual preferred shares, net of offering costs (in shares) | shares |  |  |  |  |  | 6,200,000 |  |  |  |  |  |  |  |
Gross proceeds under issuance of preferred shares |  |  |  |  |  | $ 155,000 |  |  |  |  |  |  |  |
Offering costs |  |  |  |  |  | $ 5,300 |  |  |  |  |  |  |  |
Series G Perpetual Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cumulative annual cash dividend rate |  |  |  |  | 5.875% |  |  |  |  |  |  | 5.875% |  |
Preferred shares, shares outstanding (in shares) | shares |  |  |  |  |  |  |  |  |  |  |  | 4,600,000 | 4,600,000 |
Current Liquidation Value |  |  |  |  |  |  |  |  |  |  |  | $ 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 |  |  |  |  | $ 4,100 |  |  |  |  |  |  |  |  |
Series H Perpetual Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cumulative annual cash dividend rate |  |  | 6.25% |  |  |  |  |  |  |  |  | 6.25% |  |
Preferred shares, shares outstanding (in shares) | shares |  |  |  |  |  |  |  |  |  |  |  | 4,600,000 | 0 |
Current Liquidation Value |  |  |  |  |  |  |  |  |  |  |  | $ 115,000 | $ 0 |
Liquidation preference per share (in dollars per share) | $ / shares |  |  | $ 25.00 |  |  |  |  |  |  |  |  | $ 25 |  |
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 |  |  |  |  |  |  |  |  |  |  |
Class A common shares/units |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percent of cumulative change in value of an index | 50.00% | 50.00% |  |  |  |  |  |  |  |  |  | 50.00% |  |
Redemptions of Class A units (in shares) | shares | 10,848,827 |  |  |  |  |  |  |  |  |  |  |  |  |
Stock exchange ratio | 1.4275 |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of perpetual preferred shares, net of offering costs (in shares) | shares |  |  | 13,800,000 | 14,842,982 |  |  | 36,546,170 |  |  |  |  |  |  |
Offering costs |  |  | $ 9,200 | $ 400 |  |  |  |  |  |  |  | $ 0 | $ 10,637 | $ 227
Series B Participating Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cumulative annual cash dividend rate |  | 5.00% |  |  |  |  |  |  |  |  | 5.00% | 5.00% | 5.00% | 5.00%
Preferred shares, shares outstanding (in shares) | shares |  | 4,400,000 |  |  |  |  |  |  |  |  |  |  |  |
Liquidation preference per share (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  |  |  |  | $ 25 |  |
Preferred units issued (in shares) | shares |  |  |  |  |  |  |  |  |  |  | 4,400,000 |  |  |
Gross proceeds from issuance of Preferred shares before offering costs |  |  |  |  |  |  |  |  |  |  | $ 110,000 |  |  |
Offering costs |  |  |  |  |  |  |  |  |  |  | $ 6,600 |  |  |
Series A Participating Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cumulative annual cash dividend rate |  | 5.00% |  |  |  |  |  |  |  | 5.00% |  |  | 5.00% | 5.00%
Preferred shares, shares outstanding (in shares) | shares |  | 5,060,000 |  |  |  |  |  |  |  |  |  |  |  |
Redemptions of Class A units (in shares) | shares |  | 12,398,276 |  |  |  |  |  |  |  |  |  |  |  |
Preferred units issued (in shares) | shares |  |  |  |  |  |  |  |  |  | 5,060,000 |  |  |  |
Gross proceeds from issuance of Preferred shares before offering costs |  |  |  |  |  |  |  |  |  | $ 126,500 |  |  |  |
Offering costs |  |  |  |  |  |  |  |  |  | $ 7,300 |  |  |  |

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