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Derivatives (Narrative) (Details) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Sep. 01, 2022 | Mar. 01, 2019
Derivatives, Fair Value [Line Items] |  |  |  |
Net broker receivables | $ 1.0 | $ 5.6 |  |
Margin deposit assets | 1.3 | 5.1 |  |
Increase (decrease) in variation margin deposits outstanding | (0.3) | $ 0.5 |  |
Fair value of embedded derivative liability | $ 45.2 |  |  |
Convertible Preferred Stock [Member] | Scenario, Forecast [Member] |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Basis spread |  |  |  | 2.00
Reset rate |  |  | 10.75% |
Percentage below issue price |  |  | 110.00% |
Convertible Preferred Stock [Member] | London Interbank Offered Rate (LIBOR) [Member] | Scenario, Forecast [Member] |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Basis spread |  |  | 0.0750 |

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