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Preferred Stock (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2009 | Dec. 31, 2015
Preferred Stock |  |
Proceeds from the Treasury | $ 73.0 |
Series B Stock |  |
Preferred Stock |  |
Period for payment of cumulative dividends using the initial cumulative dividend rate |  | 5 years
Cumulative dividends, initial rate for the first five years (as a percent) |  | 5.00%
Cumulative dividends rate (as a percent) |  | 9.00%
Fair value | 68.2 |
Warrants |  |
Preferred Stock |  |
Warrants, term |  | 10 years
Warrants to purchase the Company's common stock, initially authorized (in shares) |  | 815,339
Warrants, exercise price (in dollars per share) |  | $ 13.43
Fair value | $ 4.8 |

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