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Acquisitions - Chiaro Technologies LLC Purchase Price Allocation (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Nov. 30, 2016
Dec. 31, 2015
Dec. 31, 2014
Business Acquisition [Line Items]        
Goodwill $ 95,280   $ 81,448 $ 77,388
Chiaro Technologies LLC [Member]        
Business Acquisition [Line Items]        
Prepaid expenses and other current assets   $ 3    
Goodwill   2,911    
Accrued expenses   (115)    
Purchase price   4,149    
Technology-Based Intangible Assets [Member] | Chiaro Technologies LLC [Member]        
Business Acquisition [Line Items]        
Finite-lived intangible assets   $ 1,350