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Cash Convertible Senior Notes and Related Transactions, Textuals (Details) (USD $) | 3 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Mar. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009 | Feb. 15, 2012 | Mar. 29, 2010 Convertible Debt | Mar. 31, 2010 Warrant Transactions
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% |
Common Stock, Dividends, Per Share, Cash Paid | $ 0.24 | $ 0.24 | $ 0.96 | $ 0.96 | $ 0.96 |  |  |
Conversion rate of common stock shares per $1,000 of principal amount |  |  |  |  |  | 20.6991 |  |
Principal amount in conversion feature |  |  |  |  |  |  | $ 1,000 |
Conversion price of note |  |  |  |  |  | $ 48.31 |  |
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 |  | $ 62.80 | $ 62.80 |  |  |  |  |
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 |  |  |  |  |  | $ 48.31 |  |
Common stock sold related to option counterparties net share-settled warrants |  | 3,600,000 | 3,600,000 |  |  |  |  | 3,600,000
Initial strike price per share |  | 61.36 | 61.36 |  |  | 61.35 |  |

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