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Patents Cost and Accumulated Amortization (Details) (Patents [Member], USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Patents [Member]
   
Patents [Line Items]    
Gross carrying amount - patents $ 383,379 $ 61,519
Accumulated amortization - patents 69,850 36,331
Patents, net $ 313,529 $ 25,188