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Acquisitions (Details 2) - USD ($)
$ in Thousands
Sep. 30, 2016
Feb. 08, 2016
Dec. 31, 2015
Assets acquired:      
Goodwill $ 49,016   $ 39,247
Attensity, Inc      
Assets acquired:      
Property, plant and equipment and other assets   $ 290  
Intangible assets   4,917  
Goodwill   1,525  
Total assets acquired   6,732  
Liabilities assumed:      
Current portion of deferred revenue   157  
Long-term portion of deferred revenue   25  
Total liabilities assumed   182  
Purchase price of acquired assets and liabilities   $ 6,550