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Acquisitions and Divestitures - Narrative - Acquisitions (Details) $ in Thousands | Mar. 15, 2017 shares | Jan. 05, 2016 installment shares | Mar. 27, 2015 USD ($) | Sep. 30, 2017 USD ($) | Dec. 31, 2016 USD ($) | Jun. 18, 2015 ZAR / shares
--- | --- | --- | --- | --- | --- | ---
Business Acquisition [Line Items] |  |  |  |  |  |
Acquisition-related liabilities |  |  |  | $ 13,186 | $ 7,912 |
DigiCore/Ctrack |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Voting interests acquired |  |  |  |  |  | 100.00%
Acquisition share price (ZAR per share) | ZAR / shares |  |  |  |  |  | ZAR 4.40
FW |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Cash payments |  |  | $ 9,300 |  |  |
Total purchase price |  |  | 24,800 |  |  |
Other assumed liabilities |  |  | 500 |  |  |
Deferred Purchase Price |  |  | 15,000 |  |  |
Maximum contingent earn-out |  |  | $ 25,000 |  |  |
Number of cash installment payments | installment |  | 5 |  |  |  |
Period for cash installments |  | 4 years |  |  |  |
Issued to former shareholders (shares) | shares |  | 2,900,000 |  |  |  |
Number of share installments | installment |  | 3 |  |  |  |
Period for share installments |  | 3 years |  |  |  |
Stock issued for acquisition (shares) | shares | 973,334 |  |  |  |  |
Deferred Purchase Price | FW | Other Liabilities |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Acquisition-related liabilities |  |  |  | 11,300 |  |
Earn-Out | FW | Other Liabilities |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Acquisition-related liabilities |  |  |  | $ 9,800 |  |

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