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Income Taxes (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Income Tax Disclosure [Abstract]        
Effective Income Tax Rate, Continuing Operations 40.80%   35.70%  
Effective Income Tax Rate Reconciliation, Tax Credits, Research     6.00%  
Income tax expense $ (60,316)    $ (103,273)