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Debt, Textuals (Details) (USD $) | 3 Months Ended | 6 Months Ended |  |  |  |  | 3 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Jun. 30, 2012 | Jun. 30, 2012 | Jun. 30, 2011 | Jun. 30, 2012 Convertible Notes | Mar. 29, 2010 Convertible Notes | Jun. 30, 2012 Call Options | Jun. 30, 2012 Warrant Transactions | May 23, 2012 Senior Notes | Jun. 30, 2012 Minimum | Jun. 30, 2012 On or after June 1, 2016 Senior Notes | Jun. 30, 2012 Prior to June 1, 2015 Senior Notes | Jun. 30, 2012 On or after June 1, 2015 but prior to June 1, 2016 Senior Notes | Jun. 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% |  |  |  |  |
Effective interest rate |  |  |  |  | 11.00% |  |  |  |  |  |  |  |
Capitalized deferred financing costs |  |  |  |  | 5,900,000 |  |  | 6,400,000 |  |  |  |  |
Price as percentage of principal amount of notes plus any accrued and unpaid interest for repurchase of notes |  |  |  | 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 | $ 0.50 | $ 0.48 |  |  |  |  |  | $ 0.24 |  |  |  |
Conversion rate of common stock shares per $1,000 of principal amount |  |  |  | 20.7076 |  |  |  |  |  |  |  |  |
Principal amount in conversion feature |  |  |  | $ 1,000 |  |  |  |  |  |  |  |  |
Conversion price of note | $ 48.29 | $ 48.29 |  |  |  |  |  |  |  |  |  |  |
Stock price threshold for conversion of notes | $ 62.78 | $ 62.78 |  |  |  |  |  |  |  |  |  |  |
Number of trading days within 30 consecutive trading days | 20 | 20 |  |  |  |  |  |  |  |  |  |  |
Number of consecutive trading days within a calendar quarter | 30 | 30 |  |  |  |  |  |  |  |  |  |  |
Exercise price of call options |  |  |  |  |  | $ 48.29 |  |  |  |  |  |  |
Common stock sold related to option counterparties net share-settled warrants |  |  |  |  |  |  | 3,600,000 |  |  |  |  |  |
Exercise price per share on August 15, 2012 |  |  |  |  |  |  | 61.32 |  |  |  |  |  |

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