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Equity - Common Stock Narrative (Details) - USD ($) | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2017 | Dec. 31, 2016 | Sep. 30, 2017 | Sep. 30, 2016 | Aug. 03, 2017 | Sep. 08, 2015
Class of Stock [Line Items] |  |  |  |  |  |
Dividends, Common Stock, Cash | $ 0.36 | $ 0.26 | $ 11,435,000 | $ 8,145,000 |  |
Dividends, Preferred Stock, Cash |  |  | $ 9,886,000 | $ 9,886,000 |  |
Common Class C, Non-Voting [Member] |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Stock Repurchase Program, Authorized Amount |  |  |  |  | $ 5,400,000 | $ 25,000,000
Repurchase of Class C Common Stock |  |  | 668,000 |  |  |
Stock Repurchased and Retired During Period, Value | 19,600,000 |  | $ 19,600,000 |  |  |
Series A Preferred Stock [Member] |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Dividends, Preferred Stock, Cash | 0.3672 | 0.3672 |  |  |  |
Series B Preferred Stock [Member] |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Dividends, Preferred Stock, Cash | 0.4297 | 0.4297 |  |  |  |
Series C Preferred Stock [Member] |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Dividends, Preferred Stock, Cash | $ 0.3750 | $ 0.3750 |  |  |  |

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