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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 |  |

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