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Fair Value (Financial Assets and Liabilities Measured at Fair Value on a Recurring Basis) (Details) - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Significant Other Unobservable Inputs (Level 3) [Member]    
Liabilities:    
Acquisition-related contingent consideration $ 0 $ 0
Fair Value, Measurements, Recurring [Member]    
Assets:    
Total assets 53,011 63,851
Liabilities:    
Derivative instruments   $ 120
Acquisition-related contingent consideration  
Total liabilities   $ 120
Fair Value, Measurements, Recurring [Member] | Money Market Funds [Member]    
Assets:    
Total assets 22,918 23,692
Fair Value, Measurements, Recurring [Member] | Commercial Paper [Member]    
Assets:    
Total assets   1,800
Fair Value, Measurements, Recurring [Member] | U.S. Government Agencies and Securities [Member]    
Assets:    
Total assets 1,615 3,022
Fair Value, Measurements, Recurring [Member] | Corporate Bonds [Member]    
Assets:    
Total assets 28,478 35,337
Fair Value, Measurements, Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]    
Assets:    
Total assets 1,615 $ 3,022
Liabilities:    
Acquisition-related contingent consideration  
Fair Value, Measurements, Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | U.S. Government Agencies and Securities [Member]    
Assets:    
Total assets 1,615 $ 3,022
Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member]    
Assets:    
Total assets 51,396 $ 60,829
Liabilities:    
Acquisition-related contingent consideration  
Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | Money Market Funds [Member]    
Assets:    
Total assets 22,918 $ 23,692
Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | Commercial Paper [Member]    
Assets:    
Total assets   1,800
Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | Corporate Bonds [Member]    
Assets:    
Total assets $ 28,478 35,337
Fair Value, Measurements, Recurring [Member] | Significant Other Unobservable Inputs (Level 3) [Member]    
Liabilities:    
Derivative instruments   $ 120
Acquisition-related contingent consideration  
Total liabilities   $ 120