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Obligations Senior Convertible Note, Note Hedge and Warrant Transaction (Details) (USD $)
Share data in Millions, except Per Share data, unless otherwise specified |
12 Months Ended | 12 Months Ended | 12 Months Ended | 12 Months Ended | ||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
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Dec. 31, 2011
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Dec. 31, 2010
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Dec. 31, 2009
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Sep. 30, 2011
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Apr. 04, 2011
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Dec. 31, 2011
Convertible Note Hedge 1 [Member]
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Dec. 31, 2011
Convertible Note Hedge 2 [Member]
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Dec. 31, 2011
Convertible Note Hedge [Member]
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Dec. 31, 2011
Convertible Note/ Hedge Warrant, net [Member]
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Dec. 31, 2011
Note Warrant [Member]
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Dec. 31, 2011
Note Warrant2 [Member]
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Dec. 31, 2011
Convertible Debt [Member]
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Dec. 31, 2011
Convertible Debt [Member]
Convertible Notes 2016 [Member]
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Apr. 04, 2011
Convertible Debt [Member]
Convertible Notes 2016 [Member]
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Mar. 29, 2011
Convertible Debt 1 [Member]
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Mar. 29, 2011
Convertible Note Overallotment [Member]
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Dec. 31, 2011
Equity [Member]
Convertible Debt [Member]
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Apr. 04, 2011
Equity [Member]
Convertible Debt [Member]
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Mar. 30, 2011
Equity [Member]
Convertible Debt [Member]
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Mar. 29, 2011
Equity [Member]
Convertible Debt [Member]
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Dec. 31, 2011
other long-term assets [Member]
Convertible Debt [Member]
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Apr. 04, 2011
Other Long-term Liabilities [Member]
Convertible Debt [Member]
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| Debt Instrument [Line Items] | ||||||||||||||||||||||
| Debt Instrument, Interest Rate, Stated Percentage | 2.50% | |||||||||||||||||||||
| Debt Instrument, Convertible, Conversion Ratio | 17.3458 | |||||||||||||||||||||
| Debt Conversion, Converted Instrument, Amount | $ 1,000 | |||||||||||||||||||||
| Debt Instrument, Convertible, Conversion Price | $ 57.65 | |||||||||||||||||||||
| Class of Warrant or Right, Outstanding | 4.0 | 0.5 | 3.5 | |||||||||||||||||||
| Proceeds from (Payments for) Other Financing Activities | 37,100,000 | 5,600,000 | 42,700,000 | 10,900,000 | ||||||||||||||||||
| Derivative, Price Risk Option Strike Price | $ 66.3528 | |||||||||||||||||||||
| Proceeds from Issuance of Warrants | 31,740,000 | 0 | 0 | 27,600,000 | 4,100,000 | |||||||||||||||||
| Senior Notes | 230,000,000 | 0 | 200,000,000 | 30,000,000 | 43,000,000 | 187,000,000 | ||||||||||||||||
| Senior Convertible Notes [Equity net of tax] | 28,000,000 | |||||||||||||||||||||
| Payments of Debt Issuance Costs | 8,015,000 | 0 | 0 | 8,000,000 | (1,500,000) | 6,500,000 | ||||||||||||||||
| Debt Instrument, Interest Rate, Effective Percentage | 7.00% | |||||||||||||||||||||
| Interest Expense, Debt, Excluding Amortization | 4,313,000 | |||||||||||||||||||||
| Accretion of debt discount | 5,567,000 | 0 | 0 | |||||||||||||||||||
| Amortization of Financing Costs | 977,000 | 0 | 0 | |||||||||||||||||||
| Senior Convertible Note, Note Hedge, and Warrant Transaction Interest Expense | $ 10,857,000 | |||||||||||||||||||||