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Debt and Credit Arrangements (Tables)
 3 Months Ended
Mar. 31, 2012
Debt Disclosure [Abstract]  
Convertible Notes Payable Components
The following table represents the principal balance, the unamortized discount and the net carrying amount of the liability component and the carrying amount of the equity component of the Convertible Notes:
 
March 31,
2012
 
December 31,
2011
Principal balance of liability component
$
250,000

 
$
250,000

Unamortized discount
(73,288
)
 
(75,526
)
Carrying value of liability component
$
176,712

 
$
174,474

Equity Component
$
79,115

 
$
79,115