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Patents Future Amortization Expense for Intangible Assets (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Finite-Lived Intangible Assets [Line Items]  
For the remainder of 2013 $ 37,371
2014 48,586
2015 45,503
2016 44,293
2017 40,421
Thereafter 74,023
Total expected amortization expense $ 290,197