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Common Stock and Dividends (Details) (USD $) | 0 Months Ended | 1 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Oct. 15, 2013 | Apr. 19, 2013 | Apr. 09, 2013 | Feb. 28, 2013 | Oct. 15, 2012 | Apr. 20, 2012 | Apr. 30, 2009 | Sep. 30, 2013 | Nov. 01, 2013
Common Stock and Dividends |  |  |  |  |  |  |  |  |
Series A cumulative perpetual preferred shares, outstanding |  |  |  |  |  |  |  | 216,000 |
Warrants to purchase entity's common stock (in shares) |  |  |  |  |  |  |  | 1,326,238 |
Warrants, exercise price (in dollars per share) |  |  |  |  |  |  |  | $ 24.43 |
Percentage of aggregate common stock investment on exercise of warrant to Senior Preferred Stock investment |  |  |  |  |  |  |  | 15.00% |
Warrants, term |  |  |  |  |  |  |  | 10 years |
Number of warrants exercised |  |  |  |  |  |  |  | 0 |
Cash dividends paid to common shareholders (in dollars per share) | $ 0.23 | $ 0.20 |  |  | $ 0.20 | $ 0.20 |  |  |
Repurchase of common stock, authorized amount |  |  |  | $ 40,000,000 |  |  | $ 40,000,000 |  |
Period of repurchase of common stock |  |  | 12 months |  |  |  | 12 months |  |
Cumulative number of shares repurchased under all stock repurchase programs |  |  |  |  |  |  |  |  | 7,843,293
Cumulative cost of shares repurchased under all stock repurchase programs |  |  |  |  |  |  |  |  | $ 237,536,000

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