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Fair Value (Financial Assets and Liabilities Measured at Fair Value on a Recurring Basis) (Details) - Fair Value, Measurements, Recurring [Member] - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Assets: |  |
Total assets | $ 26,165 | $ 39,886
Liabilities: |  |
Acquisition-related contingent consideration | 37,098 | 41,176
Total liabilities | 37,098 | 41,176
Money Market Funds [Member] |  |
Assets: |  |
Total assets | 12,774 | 17,085
Commercial Paper [Member] |  |
Assets: |  |
Total assets | 7,472 | 5,996
U.S. Government Agencies and Securities [Member] |  |
Assets: |  |
Total assets | 2,999 | 8,529
Corporate Bonds [Member] |  |
Assets: |  |
Total assets | 2,920 | 8,276
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] |  |
Assets: |  |
Total assets | 2,999 | 7,000
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | U.S. Government Agencies and Securities [Member] |  |
Assets: |  |
Total assets | 2,999 | 7,000
Significant Other Observable Inputs (Level 2) [Member] |  |
Assets: |  |
Total assets | 23,166 | 32,886
Significant Other Observable Inputs (Level 2) [Member] | Money Market Funds [Member] |  |
Assets: |  |
Total assets | 12,774 | 17,085
Significant Other Observable Inputs (Level 2) [Member] | Commercial Paper [Member] |  |
Assets: |  |
Total assets | 7,472 | 5,996
Significant Other Observable Inputs (Level 2) [Member] | U.S. Government Agencies and Securities [Member] |  |
Assets: |  |
Total assets |  | 1,529
Significant Other Observable Inputs (Level 2) [Member] | Corporate Bonds [Member] |  |
Assets: |  |
Total assets | 2,920 | 8,276
Significant Other Unobservable Inputs (Level 3) [Member] |  |
Liabilities: |  |
Acquisition-related contingent consideration | 37,098 | 41,176
Total liabilities | $ 37,098 | $ 41,176

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