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Preferred Stock (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2015 | Mar. 31, 2015 | Jun. 30, 2014 | Mar. 31, 2009 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Preferred Stock |  |  |  |  |  |  |
Proceeds from the Treasury |  |  |  | $ 73,000 |  |  |
Payments for Repurchase of Preferred Stock and Preference Stock |  |  | $ 24,300 |  |  |  |
Dividends paid on preferred stock |  |  |  |  |  | $ (2,417) | $ (12,390)
Shares redeemed (in shares) | 31,553 | 15,778 |  |  |  |  |
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 |  |  |  | 68,200 |  |  |
Shares redeemed (in shares) |  |  | 25,669 |  |  |  |
Repurchase price percentage of liquidation value (as a percent) |  |  | 94.75% |  |  |  |
Preferred stock |  |  |  |  |  |  | $ 47,300
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 |  |  |  | $ 4,800 |  |  |
Company directors |  |  |  |  |  |  |
Preferred Stock |  |  |  |  |  |  |
Payments for Repurchase of Preferred Stock and Preference Stock |  |  | $ 1,400 |  |  |  |

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