Acquisitions and Divestitures - Narrative - Acquisitions (Details) $ in Thousands	Mar. 15, 2017 shares	Jan. 05, 2016 installment shares	Mar. 27, 2015 USD ($)	Jun. 30, 2017 USD ($)	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