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Acquisitions and Divestitures - Allocation of Purchase Price (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Oct. 05, 2015
Mar. 27, 2015
Business Acquisition [Line Items]          
Goodwill $ 37,681 $ 34,428 $ 29,520    
DigiCore/Ctrack          
Business Acquisition [Line Items]          
Cash       $ 2,437  
Accounts receivable       15,052  
Inventory       11,361  
Property, plant and equipment       5,924  
Rental assets       6,603  
Intangible assets       28,270  
Goodwill       29,273  
Other assets       5,695  
Bank facilities       (2,124)  
Accounts payable       (7,446)  
Accrued and other liabilities       (15,018)  
Noncontrolling interests       (39)  
Net assets acquired       $ 79,988  
FW          
Business Acquisition [Line Items]          
Cash         $ 205
Accounts receivable         3,331
Inventory         10,008
Property, plant and equipment         535
Intangible assets         18,880
Goodwill         3,949
Other assets         544
Accounts payable         (7,494)
Accrued and other liabilities   $ (200)     (1,916)
Deferred revenues         (270)
Note payable         (2,575)
Capital lease obligations         (420)
Net assets acquired         $ 24,777