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Cash Convertible Senior Notes and Related Transactions, Textuals (Details) (USD $) | 3 Months Ended |  |  |  |  | 3 Months Ended
--- | --- | --- | --- | --- | --- | ---
Mar. 31, 2012 | Mar. 31, 2011 | Mar. 31, 2012 Convertible Debt | Mar. 29, 2010 Convertible Debt | Mar. 31, 2012 Call Options | Mar. 31, 2012 Warrant Transactions | Mar. 31, 2010 Warrant Transactions | Mar. 31, 2012 Minimum
Cash Convertible Senior Notes and Related Transactions (Textuals) |  |  |  |  |  |  |  |
Aggregate principal amount of notes pursuant to an indenture |  |  |  | $ 175,000,000 |  |  |  |
Stated interest rate of notes pursuant to an indenture |  |  |  | 4.50% |  |  |  |
Capitalized deferred financing costs |  |  |  | 5,900,000 |  |  |  |
Effective interest rate of the Notes |  |  |  | 11.00% |  |  |  |
Payment of quarterly cash dividends | $ 0.25 | $ 0.24 |  |  |  |  |  | $ 0.24
Conversion rate of common stock shares per $1,000 of principal amount |  |  | 20.7035 |  |  |  |  |
Principal amount in conversion feature |  |  | $ 1,000 |  |  |  |  |
Conversion price of note | $ 48.30 |  |  |  |  |  |  |
Price as percentage of price of principal amount of notes plus any accrued and unpaid interest for repurchase of notes |  |  | 100.00% |  |  |  |  |
Stock price threshold for conversion of notes | $ 62.79 |  |  |  |  |  |  |
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 |  |  |  |  | $ 48.30 |  |  |
Common stock sold related to option counterparties net share-settled warrants | 3,600,000 |  |  |  |  |  | 3,600,000 |
Initial strike price per share | 61.35 |  |  |  |  | 61.33 |  |

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