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Preferred Stock (Details) (USD $) | 3 Months Ended |  |  | 0 Months Ended | 3 Months Ended | 6 Months Ended |  |  | 6 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Mar. 31, 2009 | Jun. 30, 2014 | Dec. 31, 2013 | Apr. 28, 2014 Series B Stock | Jun. 30, 2014 Series B Stock | Jun. 30, 2014 Series B Stock item | Dec. 31, 2013 Series B Stock | Mar. 31, 2009 Series B Stock | Jun. 30, 2014 Warrants | Mar. 31, 2009 Warrants
Common and 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% |  |  |  |
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 |
Proceeds from the Treasury | $ 73,000,000 |  |  |  |  |  |  |  |  |
Fair value |  |  |  |  |  |  |  | 68,200,000 |  | 4,800,000
Number of quarters in which if the Company did not pay dividends, will allow the holder the right to appoint representatives to the Company's board of directors |  |  |  |  |  | 6 |  |  |  |
Payments for repurchase of preferred stock |  |  |  | 24,300,000 | 24,300,000 |  |  |  |  |
Repurchase price percentage of liquidation value (as a percent) |  |  |  | 94.75% | 94.75% |  |  |  |  |
Shares redeemed (in shares) |  |  |  | 25,669 | 25,669 |  |  |  |  |
Preferred stock |  | $ 47,331,000 | $ 72,942,000 |  |  |  | $ 72,900,000 |  |  |

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