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Income Taxes (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Valuation Allowance [Line Items]    
Effective Income Tax Rate, Continuing Operations (11.00%) 4.30%
Goodwill impairment $ 150,400
Valuation allowance recorded against deferred tax assets $ 11,900  
MakerBot [Member]    
Valuation Allowance [Line Items]    
Goodwill impairment   150,400
Valuation allowance recorded against deferred tax assets   17,200
Reversal of deferred tax liabilities   $ 17,200