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Long -Term Debt (Details 1) (USD $)	Mar. 31, 2012	Dec. 31, 2011
Entries to Record Proceeds From Convertible Notes and Sold Warrants Cost of Purchased Call Options
Long-term debt	$ 805,140,000	$ 620,000,000
Senior Convertible Notes Due 2017 [Member]
Entries to Record Proceeds From Convertible Notes and Sold Warrants Cost of Purchased Call Options
Cash	260,500,000
Other assets (deferred financing costs)	6,800,000
Long-term debt	230,100,000
Additional paid-in capital	$ (38,100,000)

Additional paid-in capital or capital from other sources not otherwise defined. Use this element if the registrant wishes to distinguish between Additional paid-in capital from Other Additional Capital. The following adjustments are some examples of Other Additional Capital: recording the issuance of debt issued with a beneficial conversion feature, the issuance of convertible debt at a substantial premium, certain tax consequences of equity instruments awarded to employees, and accounting for certain expenses and liabilities paid for by the principal shareholder.

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