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Business Combinations - Explosive Trace Detection (Details) - USD ($)
$ in Thousands
Jul. 07, 2017
Dec. 31, 2018
Jun. 30, 2018
Allocation of total consideration to assets acquired and liabilities assumed      
Goodwill   $ 305,164 $ 292,213
ETD      
Business Combinations      
Total purchase price $ 80,500    
Allocation of total consideration to assets acquired and liabilities assumed      
Cash and cash equivalents 4    
Accounts receivable 15,517    
Inventories 11,678    
Property and equipment 1,599    
Intangible assets 30,370    
Deferred tax assets 2,738    
Other long-term assets 297    
Accounts payable (4,784)    
Accrued payroll and related expenses (2,116)    
Deferred revenues - current (924)    
Accrued warranties (2,068)    
Advances from customers (670)    
Other accrued expenses and current liabilities (1,074)    
Deferred revenues - long term (232)    
Net assets acquired 50,335    
Goodwill 30,132    
Total consideration $ 80,467