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Income Taxes (Details) (USD $)
3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Dec. 31, 2013
Income Tax Disclosure [Abstract]          
Effective income tax provision (in hundredths) 132.40% 131.30% 45.70% 52.20%  
Statutory U.S. federal income tax (in hundredths) 35.00%   35.00% 35.00%  
Income Tax Examination [Line Items]          
Unrecognized Tax Benefits $ 26,400,000   $ 26,400,000   $ 26,100,000
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued 11,500,000   11,500,000   11.0
Danish tax authority
         
Income Tax Examination [Line Items]          
Royalty Rate Assessed on Danish Earnings     20.00%    
Cumulative Assessment Amount Including Interest And Penalties $ 236,300,000   $ 236,300,000