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Debt, Textuals (Details) (USD $) | 3 Months Ended | 9 Months Ended |  | 1 Months Ended | 9 Months Ended | 12 Months Ended |  |  |  |  |  |  | 9 Months Ended |  | 3 Months Ended |
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Sep. 30, 2012 | Sep. 30, 2012 | Sep. 30, 2011 | Nov. 15, 2012 | Oct. 31, 2012 Convertible Notes | Sep. 30, 2012 Convertible Notes | Dec. 31, 2010 Convertible Notes | Nov. 15, 2012 Convertible Notes | Mar. 29, 2010 Convertible Notes | Nov. 15, 2012 Call Options | Sep. 30, 2012 Call Options | Nov. 15, 2012 Warrant Transactions | Sep. 30, 2012 Warrant Transactions | Sep. 30, 2012 Senior Notes | May 23, 2012 Senior Notes | Sep. 30, 2012 Minimum | Sep. 30, 2012 On or after June 1, 2016 Senior Notes | Sep. 30, 2012 Prior to June 1, 2015 Senior Notes | Sep. 30, 2012 On or after June 1, 2015 but prior to June 1, 2016 Senior Notes | Sep. 30, 2012 Change in control Senior Notes
Debt Instruments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount of notes |  |  |  |  |  |  |  |  | $ 175,000,000 |  |  |  |  |  | $ 225,000,000 |  |  |  |  |
Interest rate |  |  |  |  |  |  |  |  | 4.50% |  |  |  |  |  | 8.25% |  |  |  |  |
Transaction fees capitalized |  | 6,600,000 | 2,100,000 |  |  |  | 5,900,000 |  |  |  |  |  |  | 6,600,000 |  |  |  |  |  |
Redemption price of debt as a percentage of principal amount |  |  |  |  |  | 100.00% |  |  |  |  |  |  |  |  |  |  | 104.125% | 108.25% | 100.00% | 101.00%
Percentage of principal amount of Notes that may be redeemed |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 35.00% |  |
Payment of quarterly cash dividends | $ 0.25 | $ 0.75 | $ 0.72 |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.24 |  |  |  |
Conversion rate of common stock shares per $1,000 of principal amount |  |  |  |  | 20.7111 | 20.7076 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount in conversion feature |  |  |  |  |  |  |  | $ 1,000 |  |  |  |  |  |  |  |  |  |  |  |
Conversion price of note | $ 48.29 | $ 48.29 |  | $ 48.28 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock price threshold for conversion of notes |  |  |  |  |  | $ 62.78 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of trading days within 30 consecutive trading days |  |  |  |  |  | 20 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of consecutive trading days within a calendar quarter |  |  |  |  |  | 30 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exercise price of call options |  |  |  |  |  |  |  |  |  | $ 48.28 | $ 48.29 |  |  |  |  |  |  |  |  |
Common stock sold related to option counterparties net share-settled warrants |  |  |  |  |  |  |  |  |  |  |  |  | 3,600,000 |  |  |  |  |  |  |
Exercise price per share of Warrants |  |  |  |  |  |  |  |  |  |  |  | 61.31 | 61.32 |  |  |  |  |  |  |

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