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Convertible Notes (Principal Balance, Unamortized Discount And Net Carrying Amount Of The Liability Components And Equity Components) (Details) (USD $)
In Thousands
Jun. 30, 2011
Liability component, Unamortized Discount $ 56,677
4.75% Convertible Senior Notes Due On 2018 [Member]
 
Liability component, Principal Balance 230,000
Liability component, Unamortized Discount 56,677
Liability component, Net Carrying Amount 173,323
Equity component, Net Carrying Amount $ 34,427