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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
Jun. 30, 2017
Dec. 31, 2016
Assets:    
Total assets $ 26,039 $ 39,886
Liabilities:    
Acquisition-related contingent consideration 41,176 41,176
Total liabilities 41,176 41,176
Money Market Funds [Member]    
Assets:    
Total assets 12,074 17,085
Commercial Paper [Member]    
Assets:    
Total assets 5,473 5,996
U.S. Government Agencies and Securities [Member]    
Assets:    
Total assets 6,992 8,529
Corporate Bonds [Member]    
Assets:    
Total assets 1,500 8,276
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]    
Assets:    
Total assets 6,992 7,000
Liabilities:    
Acquisition-related contingent consideration  
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | U.S. Government Agencies and Securities [Member]    
Assets:    
Total assets 6,992 7,000
Significant Other Observable Inputs (Level 2) [Member]    
Assets:    
Total assets 19,047 32,886
Liabilities:    
Acquisition-related contingent consideration  
Significant Other Observable Inputs (Level 2) [Member] | Money Market Funds [Member]    
Assets:    
Total assets 12,074 17,085
Significant Other Observable Inputs (Level 2) [Member] | Commercial Paper [Member]    
Assets:    
Total assets 5,473 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 1,500 8,276
Significant Other Unobservable Inputs (Level 3) [Member]    
Liabilities:    
Acquisition-related contingent consideration 41,176 41,176
Total liabilities $ 41,176 $ 41,176