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Subsequent Events (Details) (USD $) | 0 Months Ended | 9 Months Ended | 0 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Oct. 14, 2014 Subsequent Event | Sep. 30, 2014 Convertible Notes | Oct. 14, 2014 Convertible Notes Subsequent Event | Oct. 14, 2014 Convertible Notes Subsequent Event | Sep. 30, 2014 Call Options | Oct. 14, 2014 Call Options Subsequent Event | Sep. 30, 2014 Warrants | Sep. 30, 2013 Warrants | Oct. 14, 2014 Warrants Subsequent Event
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |
Cash dividend declared per common share | $ 0.35 |  |  |  |  |  |  |  |
Cash dividends declared | $ 6,300,000 |  |  |  |  |  |  |  |
Conversion rate of common stock shares per $1,000 of principal amount |  | 20.8862 | 20.9185 |  |  |  |  |  |
Principal amount in conversion feature |  | $ 1,000 |  | $ 1,000 |  |  |  |  |
Conversion price per share of note |  | $ 47.88 |  | $ 47.80 |  |  |  |  |
Exercise price per share of Call Options |  |  |  |  | $ 47.88 | $ 47.80 |  |  |
Exercise price per share of Warrants |  |  |  |  |  |  | 60.80 | 61.14 | 60.70

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