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Fair Value Measurements (Details Textual) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2017 | Dec. 31, 2016
Rochester [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Expected Royalty Duration | 1.6 |
Senior Notes due Two Thousand Twenty One [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt Instrument, Unamortized Discount (Premium), Net | $ 1.9 | $ 2.0

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