Borrowings (Schedule Of Carrying Value Of The Convertible Notes) (Details) (USD $)	Dec. 31, 2011	Dec. 31, 2010
Borrowings [Abstract]
Principal amount of the Convertible Notes	$ 400,000,000	$ 400,000,000
Less: Unamortized debt discount on 3.875% Convertible Senior Subordinated Notes due 2017	(70,200,000)	(79,900,000)
Net carrying amount	$ 329,800,000	$ 320,100,000

The amount of debt discount that was originally recognized at the issuance of the instrument that has yet to be amortized.

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Balance Type:	debit
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