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Capital (Details) - USD ($) $ / shares in Units, $ in Thousands |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Aug. 23, 2016 | Jun. 30, 2018 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Partners' Capital [Line Items] |  |  |  |  |
Gross proceeds from sale of shares | $ 621,800 | $ 4,700 | $ 4,749 | $ 0 | $ 611,206
Shares and Units [Abstract] |  |  |  |  |
OP units outstanding (shares) |  |  | 303,300,000 |  |
OP units owned by the Company (shares) |  |  | 174,900,000 |  |
OP units owned by the Company, percent |  |  | 57.70% |  |
OP units not owned by the Company (shares) |  |  | 128,400,000 |  |
OP units not owned by the Company, percent |  |  | 42.30% |  |
Percentage of dividends on common stock received until performance criteria met for LTIP units |  |  | 10.00% |  |
Percentage of dividends on common stock received after performance criteria met for LTIP units |  |  | 90.00% |  |
Percentage of dividends on common stock received in periods after performance criteria met for LTIP units |  |  | 100.00% |  |
Private perpetual preferred units, liquidation preference per share (in dollars per share) |  |  | $ 16.62 | $ 16.62 |
Series PR Common Units |  |  |  |  |
Shares and Units [Abstract] |  |  |  |  |
OP units not owned by the Company (shares) |  |  | 86,202,638 | 91,759,741 |
Private Perpetual Preferred Units |  |  |  |  |
Shares and Units [Abstract] |  |  |  |  |
Private perpetual preferred units (shares) |  |  | 1,560,360 |  |
Private perpetual preferred units, liquidation preference per share (in dollars per share) |  |  | $ 16.62 |  |
Dividend declared (in dollars per share) |  |  | $ 0.60 |  |
Common shares | Common Class A |  |  |  |  |
Partners' Capital [Line Items] |  |  |  |  |
Issuance of common shares (in shares) |  | 284,015 |  |  | 29,610,854
Common shares issued (USD per share) | $ 21.00 | $ 16.72 |  |  |
General Partner | Series PR Common Units |  |  |  |  |
Partners' Capital [Line Items] |  |  |  |  |
Issuance of common shares (in shares) | 29,610,854 |  | 284,000 |  | 29,611,000
Q REIT Holding LLC |  |  |  |  |
Partners' Capital [Line Items] |  |  |  |  |
Interest held by subsidiary of QIA | 9.90% | 9.90% |  |  |

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