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Investments and Fair Value Measurements, Fair Value (Details) - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
Cash Equivalents and Investments [Abstract]    
Money market fund $ 0 $ 23
Certificates of deposit [1] 11,303 6,454
Recurring [Member]    
Cash Equivalents and Investments [Abstract]    
Money market fund   23
Certificates of deposit 19,393 10,183
Corporate bonds 8,966 9,186
Corporate equity securities 575 754
Total 28,934 20,146
Liabilities [Abstract]    
Liabilities   0
Foreign currency hedge obligations 29  
Recurring [Member] | Quoted Prices in Active Markets of Identical Assets (Level 1) [Member]    
Cash Equivalents and Investments [Abstract]    
Money market fund   23
Certificates of deposit 0 0
Corporate bonds 0 0
Corporate equity securities 575 754
Total 575 777
Liabilities [Abstract]    
Liabilities   0
Foreign currency hedge obligations 0  
Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member]    
Cash Equivalents and Investments [Abstract]    
Money market fund   0
Certificates of deposit 19,393 10,183
Corporate bonds 8,966 9,186
Corporate equity securities 0 0
Total 28,359 19,369
Liabilities [Abstract]    
Liabilities   0
Foreign currency hedge obligations 0  
Recurring [Member] | Significant Other Observable Inputs (Level 3) [Member]    
Cash Equivalents and Investments [Abstract]    
Money market fund   0
Certificates of deposit 0 0
Corporate bonds 0 0
Corporate equity securities 0 0
Total 0 0
Liabilities [Abstract]    
Liabilities   $ 0
Foreign currency hedge obligations $ 29  
[1] Certificate of deposit with original maturities of less than 90 days.