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Equity - Preferred Stock (Details) - shares | Dec. 31, 2015 | Jun. 30, 2015 | Dec. 31, 2014
--- | --- | --- | ---
Class of Stock [Line Items] |  |  |
Shares authorized (in shares) | 50,000,000 | 50,000,000 | 50,000,000
8.5% Convertible perpetual preferred stock |  |  |
Class of Stock [Line Items] |  |  |
Shares outstanding at end of period (in shares) | 2,650,000 |  | 2,650,000
7.0% Convertible perpetual preferred stock |  |  |
Class of Stock [Line Items] |  |  |
Shares outstanding at end of period (in shares) | 2,770,000 |  | 3,000,000

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