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Equity - Narrative (Details) - USD ($) |  |  | 3 Months Ended | 6 Months Ended | 42 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Jun. 12, 2019 | May 13, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Mar. 31, 2019 | Mar. 14, 2019 | Aug. 31, 2017 | Sep. 30, 2015
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Retirement of Series B preferred stock |  |  |  |  |  |  |  |  | $ 75,000,000 | $ 0 |  |  |  |
Loss on retirement of preferred stock |  |  | $ 1,956,000 |  |  |  | $ 0 |  | $ 1,956,000 | $ 0 |  |  |  |
Quarterly dividend on all classes of common stock (in dollars per share) |  |  | $ 700.00 | $ 0.70 | $ 0.58 | $ 0.58 | $ 0.58 | $ 0.58 |  |  |  |  |  |
Series D Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of stock (in shares) |  | 4,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |
Dividend rate |  |  |  |  |  |  |  |  | 5.70% |  |  |  |  |
Preferred stock, par value (in dollars per share) |  |  | $ 25 |  | 25 |  |  |  | $ 25 |  |  |  |  |
Aggregate outstanding |  |  | $ 100,000,000.0 |  |  |  |  |  | $ 100,000,000.0 |  |  |  |  |
Issuance costs |  | $ 3,300,000 |  |  |  |  |  |  |  |  |  |  |  |
Series B Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividend rate |  |  |  |  |  |  |  |  | 6.875% |  |  |  |  |
Preferred stock, par value (in dollars per share) |  |  | $ 25 |  | $ 25 |  |  |  | $ 25 |  |  |  |  |
Retirement of Series B preferred stock | $ 75,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |
Loss on retirement of preferred stock | $ 2,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |
Common Class C, Non-Voting [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock authorized for repurchase |  |  |  |  |  |  |  |  |  |  |  | $ 10,000,000.0 | $ 5,400,000 | $ 25,000,000.0
Shares repurchased (in shares) |  |  |  |  |  |  |  |  | 0 |  | 668,000 |  |  |
Shares repurchased |  |  |  |  |  |  |  |  |  |  | $ 19,600,000 |  |  |

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