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ACQUISITIONS (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jul. 01, 2016
Jun. 30, 2016
May 03, 2016
May 03, 2016
Apr. 07, 2016
Apr. 07, 2016
Jan. 01, 2015
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Acquisitions                      
Total consideration       $ 41,563              
Revenue               $ 99,991 $ 90,326 $ 189,676 $ 175,670
Income (Loss) from Continuing Operations before Income Taxes               1,059 28,026 16,487 26,657
Transaction related charges               10,410 $ 137 14,065 $ 316
Bermuda wireless operations                      
Acquisitions                      
Total consideration       7,045              
Vibrant Energy Investment [Member]                      
Acquisitions                      
Cash consideration           $ 3,500          
Purchase price         $ 6,193 6,193          
Remaining purchase price         2,700 $ 2,700          
Total consideration         $ 6,193            
Revenue                   100  
Transaction related charges   $ 10,200               9,000  
Innovative [Member]                      
Acquisitions                      
Total consideration $ 145,000                    
Cash-on-hand used to fund the purchase price $ 85,000                    
KeyTech [Member]                      
Acquisitions                      
Purchase price     $ 74,731 $ 74,731              
Ownership percentage     51.00% 51.00%              
Retirement of debt             $ 24,700        
Total consideration       $ 34,518              
Transaction fee   $ 3,200 $ 4,100 $ 4,100       $ 3,200   3,200  
Revenue                   14,000  
Income (Loss) from Continuing Operations before Income Taxes                   $ 3,000  
KeyTech [Member] | CellOne [Member]                      
Acquisitions                      
Ownership percentage     43.00% 43.00%              
KeyTech and BDC                      
Acquisitions                      
Ownership interest held by minority shareholders     15.00% 15.00%              
Telecommunication Equipment                      
Acquisitions                      
Discounted rate used for cash flows       15.00%              
Telecommunication Equipment | Minimum                      
Acquisitions                      
Useful life       3 years              
Telecommunication Equipment | Maximum                      
Acquisitions                      
Useful life       18 years              
Telecommunication Equipment | Customer relationships | Minimum                      
Acquisitions                      
Estimated life     9 years                
Telecommunication Equipment | Customer relationships | Maximum                      
Acquisitions                      
Estimated life     12 years