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Income Taxes (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Income Tax Disclosure [Abstract]        
Effective Income Tax Rate, Continuing Operations 37.40%   36.40%  
Effective Income Tax Rate Reconciliation, Tax Credits, Research     4.30%  
Income tax expense $ (84,378)    $ (187,651)