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Shareholders' Equity - Distributions (Details) - USD ($) $ / shares in Units, $ in Thousands | Oct. 12, 2017 | Aug. 17, 2017 | May 18, 2017 | Feb. 21, 2017 | Jan. 17, 2017
--- | --- | --- | --- | --- | ---
Distributions |  |  |  |  |
Common stock, quarterly per share distribution (in dollars per share) |  | $ 0.52 | $ 0.52 | $ 0.51 |
Common stock dividend |  | $ 85,427 | $ 85,419 | $ 83,777 |
Series D preferred shareholders' |  |  |  |  |
Distributions |  |  |  |  |
Preferred stock, per share distribution (in dollars per share) |  |  |  |  | $ 0.4453
Preferred stock dividend |  |  |  |  | $ 5,166
Subsequent event |  |  |  |  |
Distributions |  |  |  |  |
Common stock dividend | $ 85,462 |  |  |  |
Quarterly distribution declared (in dollars per share) | $ 0.52 |  |  |  |

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