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Business Combination - Fair Value of Assets and Liabilities Acquired (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Sep. 11, 2017
Dec. 31, 2016
Business Acquisition [Line Items]      
Goodwill $ 117,435   $ 82,554
Lightning Diversion Systems, Inc.      
Business Acquisition [Line Items]      
Cash   $ 2,223  
Accounts receivable   918  
Inventories   1,732  
Other current assets   54  
Property and equipment   138  
Intangible assets   22,400  
Goodwill   34,881  
Total assets acquired   62,346  
Current liabilities   (325)  
Total liabilities assumed   (325)  
Total purchase price allocation   $ 62,021