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Goodwill and Other Intangible Assets - Goodwill reconciliation (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Goodwill [Roll Forward]    
Balance at beginning of period $ 29,520 $ 0
Effect of change in foreign currency exchange rates 3,477 (3,507)
Balance at end of period 34,428 29,520
FW    
Goodwill [Roll Forward]    
Acquisition   29,273
FW adjustment 195  
DigiCore/Ctrack    
Goodwill [Roll Forward]    
Acquisition   $ 3,754
Ctrack adjustment [1] $ 1,236  
[1] During the year ended December 31, 2016, the Company identified the need for an immaterial adjustment in the recording of net assets and goodwill in the accounting for the acquisition of Ctrack. As a result, the Company has recorded an adjustment during the year ended December 31, 2016 that increased goodwill and decreased accounts receivable. There was no change in reported cash flows in any period related to this adjustment.