Fair Value Measurements and Investments (Details) (Recurring basis, USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Quoted Prices in Active Markets (Level 1)
   
Assets:    
Money market funds   $ 4,004
Marketable equity securities 423 337
Total 423 4,341
Significant Other Observable Inputs (Level 2)
   
Assets:    
Currency forward derivatives/options 514 445
Total 514 445
Significant Unobservable Inputs (Level 3)
   
Assets:    
Springbox revenue sharing 768 768
Total 768 768
Liabilities:    
Revenue earnouts 1,656 2,857
Total Fair Value Measurements
   
Assets:    
Money market funds   4,004
Currency forward derivatives/options 514 445
Springbox revenue sharing 768 768
Marketable equity securities 423 337
Total 1,705 5,554
Liabilities:    
Revenue earnouts $ 1,656 $ 2,857