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Series B Preferred Stock (“Series B Stock”) (Details) (USD $) | 3 Months Ended | 9 Months Ended |  | 0 Months Ended | 1 Months Ended | 3 Months Ended | 9 Months Ended |  |  | 9 Months Ended |
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Mar. 31, 2009 | Sep. 30, 2014 | Dec. 31, 2013 | Aug. 15, 2014 Series B Stock | May 15, 2014 Series B Stock | Apr. 28, 2014 Series B Stock | May 31, 2014 Series B Stock | Jun. 30, 2014 Series B Stock | Sep. 30, 2014 Series B Stock item | Dec. 31, 2013 Series B Stock | Mar. 31, 2009 Series B Stock | Sep. 30, 2014 Warrants | Mar. 31, 2009 Warrants
Series B Preferred Stock (“Series B 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 of Dividends |  | 11,323,000 |  | 1,100,000 | 10,300,000 |  | 10,300,000 |  |  |  |  |  |
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 |  |  |  |  |  | $ 47,300,000 | $ 72,900,000 |  |  |

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