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Subsequent Events (Details) (USD $) | 6 Months Ended | 12 Months Ended | 0 Months Ended | 6 Months Ended | 0 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jun. 30, 2014 | Jun. 30, 2013 | Dec. 31, 2013 | Jul. 15, 2014 Subsequent Event | Jun. 30, 2014 Convertible Notes | Jul. 15, 2014 Convertible Notes Subsequent Event | Jun. 30, 2014 Call Options | Jul. 15, 2014 Call Options Subsequent Event | Jun. 30, 2014 Warrants | Jun. 30, 2013 Warrants | Jul. 15, 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 |  |  |  |  | 20.8549 | 20.8862 |  |  |  |  |
Principal amount in conversion feature |  |  |  |  | 1,000 | 1,000 |  |  |  |  |
Conversion price per share of note |  |  |  |  | $ 47.95 | $ 47.88 |  |  |  |  |
Exercise price per share of Call Options |  |  |  |  |  |  | $ 47.95 | $ 47.88 |  |  |
Exercise price per share of Warrants |  |  |  |  |  |  |  |  | 60.89 | 61.19 | 60.80
Repurchase of common stock, shares | 346,781 | 654,277 |  |  |  |  |  |  |  |  |
Weighted-average price per share of common stock repurchased | $ 69.25 | $ 61.95 |  |  |  |  |  |  |  |  |
Common share amount available for additional share repurchase | $ 93,600,000 |  | $ 117,600,000 |  |  |  |  |  |  |  |

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