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Acquisitions - Narrative (Details) - USD ($)
$ in Thousands
1 Months Ended
Dec. 31, 2016
May 31, 2016
Sep. 30, 2017
Business Acquisition [Line Items]      
Goodwill $ 51,036   $ 51,036
Pebble Industries, Inc [Member]      
Business Acquisition [Line Items]      
Cash paid for acquisition 23,400    
Goodwill 14,400    
Assumed liabilities 600    
Consideration held as security for indemnifications obligations $ 3,500    
Amortization period 5 years    
Pebble Industries, Inc [Member] | In Process Research and Development [Member]      
Business Acquisition [Line Items]      
Intangibles acquired $ 9,600    
Vector Watch S.R.L. [Member]      
Business Acquisition [Line Items]      
Cash paid for acquisition 15,000    
Goodwill 11,400    
Assumed liabilities 300    
Consideration held as security for indemnifications obligations 2,300    
Vector Watch S.R.L. [Member] | In Process Research and Development [Member]      
Business Acquisition [Line Items]      
Intangibles acquired $ 3,900    
Amortization period 2 years 6 months    
Coin, Inc [Member]      
Business Acquisition [Line Items]      
Cash paid for acquisition   $ 7,000  
Goodwill   3,100  
Coin, Inc [Member] | In Process Research and Development [Member]      
Business Acquisition [Line Items]      
Intangibles acquired   $ 3,900