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Shareholder's Equity - Distribution to Common Shareholders (Details) - USD ($) $ / shares in Units, $ in Thousands |  |  |  |  |  |  |  | 9 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | ---
Oct. 18, 2018 | Aug. 16, 2018 | Jul. 19, 2018 | May 17, 2018 | Apr. 19, 2018 | Feb. 22, 2018 | Jan. 19, 2018 | Sep. 30, 2018 | Sep. 30, 2017
Stockholders' Equity Note [Abstract] |  |  |  |  |  |  |  |  |
Dividends paid (in dollars per share) |  | $ 0.39 |  | $ 0.39 |  | $ 0.39 |  |  |
Distributions to shareholders |  | $ 92,681 |  | $ 92,676 |  | $ 92,674 |  | $ 278,031 | $ 277,932
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |
Distributions to common shareholders declared (in dollars per share) |  |  | $ 0.39 |  | $ 0.39 |  | $ 0.39 |  |
Distribution payable |  |  | $ 92,681 |  | $ 92,676 |  | $ 92,674 |  |
Subsequent Event |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |
Distributions to common shareholders declared (in dollars per share) | $ 0.39 |  |  |  |  |  |  |  |
Distribution payable | $ 92,715 |  |  |  |  |  |  |  |

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