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Acquisitions and Divestitures - Narrative - Acquisitions (Details)
$ in Thousands, shares in Millions
 3 Months Ended 6 Months Ended 12 Months Ended
Jan. 05, 2016
installment
shares
Oct. 05, 2015
USD ($)
Mar. 27, 2015
USD ($)
Dec. 31, 2015
USD ($)
Jun. 30, 2016
USD ($)
Dec. 31, 2015
USD ($)
Jun. 18, 2015
ZAR / shares
Business Acquisition [Line Items]              
Acquisition-related liabilities       $ 5,274 $ 8,689 $ 5,274  
DigiCore              
Business Acquisition [Line Items]              
Voting interests acquired             100.00%
Acquisition share price (ZAR per share) | ZAR / shares             ZAR 4.40
Cash payments       79,365      
Total purchase price   $ 80,000   79,988      
Future issuance of common stock       623      
DigiCore | General and Administrative Expense              
Business Acquisition [Line Items]              
Acquisition costs           1,700  
Feeney Wireless              
Business Acquisition [Line Items]              
Cash payments     $ 9,300     9,268  
Total purchase price     24,800     24,777  
Escrow amount and certain other pre-closing adjustments     1,500        
Other assumed liabilities     500     509  
Future issuance of common stock     15,000     15,000  
Maximum contingent earn-out     $ 25,000        
Acquisition-related liabilities       $ 6,900   6,900  
Number of cash installment payments | installment 5            
Period for cash installments 4 years            
Issued to former shareholders (shares) | shares 2.9            
Number of share installments | installment 3            
Period for share installments 3 years            
Contingent consideration expense         800    
Feeney Wireless | Other Liabilities              
Business Acquisition [Line Items]              
Acquisition-related liabilities         $ 6,100    
Feeney Wireless | General and Administrative Expense              
Business Acquisition [Line Items]              
Acquisition costs           $ 900