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Acquisitions - Allocation of Purchase Price (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015 | Oct. 05, 2015 | Mar. 27, 2015 | Dec. 31, 2014
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Business Acquisition [Line Items] |  |  |  |  |  |  |
Goodwill |  | $ 34,428 | $ 29,520 |  |  |  | $ 0
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 | [1] |  |  |  | 3,949 |  |
Other assets |  |  |  |  | 544 |  |
Accounts payable |  |  |  |  | (7,494) |  |
Accrued and other liabilities |  | $ (200) |  |  | (1,916) | [1] |
Deferred revenues |  |  |  |  | (270) |  |
Note payable |  |  |  |  | (2,575) |  |
Capital lease obligations |  |  |  |  | (420) |  |
Net assets acquired |  |  |  |  | $ 24,777 |  |
[1] | Reflects measurement-period adjustments recorded by the Company in accordance with ASU 2015-16. During the year ended December 31, 2016, the Company recorded a measurement-period adjustment to the allocation of fair value resulting in a $0.2 million increase to accrued and other liabilities and a corresponding $0.2 million increase to goodwill.

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