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ACQUISITIONS AND DISPOSITIONS - Purchase Price Allocation (Details) - USD ($)
$ in Thousands
 1 Months Ended 3 Months Ended 12 Months Ended 24 Months Ended
Jul. 01, 2016
May 03, 2016
Apr. 07, 2016
Jul. 31, 2016
Mar. 31, 2015
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2015
Consideration Transferred                                  
Pension funding required by Innovative acquisition                           $ 22,494      
Purchase price allocation:                                  
Goodwill           $ 62,873       $ 45,077       62,873 $ 45,077   $ 45,077
Gain on KeyTech bargain purchase                           7,304      
Increase in goodwill                                 0
Purchase price allocation BDC:                                  
Revenue           128,531 $ 138,795 $ 99,991 $ 89,686 82,916 $ 96,782 $ 90,326 $ 85,345 457,003 355,369 $ 336,347  
Income (Loss) from Continuing Operations before Income Taxes           7,590 $ 21,296 $ 1,059 $ 15,429 7,763 $ 21,782 $ 28,026 $ (1,370) 45,374 56,201 86,168  
Transaction related charges                           16,279 7,182 $ 2,959  
Loss on deconsolidation of subsidiary                             19,937    
Deconsolidation of non-controlling interests                           310 (20,013)    
Goodwill                                  
Impairment of long-lived assets                           3,600      
Goodwill impairment                           $ 7,491      
Discount rate (as a percent)                           14.00%      
Impairment of long-lived assets                           $ 11,425      
Aruba                                  
Purchase price allocation BDC:                                  
Revenue                           2,800      
Postretirement Benefits                                  
Consideration Transferred                                  
Restricted cash           5,100               5,100      
Non-Controlling Interests                                  
Purchase price allocation BDC:                                  
Deconsolidation of non-controlling interests                           310 (20,013)    
BDC                                  
Consideration Transferred                                  
Cash consideration   $ 7,045                              
Total value to allocate                                  
Business Combination Total Value Allocation   7,045                              
Purchase price allocation BDC:                                  
Acquired carrying value of BDC non-controlling interest acquired   2,940                              
Excess of purchase price paid over carrying value of non-controlling interest acquired   4,105                              
One Communications (formerly KeyTech)                                  
Consideration Transferred                                  
Cash consideration   34,518                              
Total value to allocate                                  
Non-controlling interests   32,909                              
Business Combination Total Value Allocation   67,427                              
Purchase price allocation:                                  
Cash   8,185                              
Accounts receivable   6,451                              
Other current assets   3,241                              
Property, plant and equipment   100,892                              
Intangible assets   10,590                              
Other Assets   3,464                              
Accounts payable and accrued liabilities   (16,051)                              
Advance payments and deposits   (6,683)                              
Current debt   (6,429)                              
Long-term debt   (28,929)                              
Net assets acquired   74,731                              
Gain on KeyTech bargain purchase   7,304                              
Purchase price allocation BDC:                                  
Revenue                           55,500      
Income (Loss) from Continuing Operations before Income Taxes                           2,800      
Transaction related charges relating to legal, accounting and consulting services.   4,300                              
Transaction related charges                           3,400      
One Communications (formerly KeyTech) and BDC                                  
Consideration Transferred                                  
Total consideration   41,563                              
Total value to allocate                                  
Business Combination Total Value Allocation   $ 74,472                              
Innovative                                  
Consideration Transferred                                  
Total consideration $ 111,860                                
Cash-on-hand used to fund the purchase price 51,900                                
Pension funding required by Innovative acquisition           22,500                      
Purchase price reduction 400                                
Restricted cash 5,300                                
Purchase price 145,000                                
Purchase price adjustments 5,300                                
Total value to allocate                                  
Non-controlling interests 221                                
Business Combination Total Value Allocation 112,081                                
Purchase price allocation:                                  
Cash 4,229                                
Accounts receivable 6,553                                
Materials & supplies 6,533                                
Other current assets 1,927                                
Property, plant and equipment 108,284                                
Telecommunication licenses 7,623                                
Goodwill 20,586                                
Intangible assets 7,800                                
Other Assets 4,394                                
Accounts payable and accrued liabilities (15,971)                                
Advance payments and deposits (7,793)                                
Deferred tax liability (2,935)                                
Pension liability (29,149)                                
Net assets acquired 112,081                                
Purchase price allocation BDC:                                  
Revenue                           53,000      
Income (Loss) from Continuing Operations before Income Taxes                           1,500      
Transaction related charges relating to legal, accounting and consulting services. 4,100                                
Transaction related charges                           2,200      
Innovative | Pension Benefit                                  
Consideration Transferred                                  
Pension funding required by Innovative acquisition           22,500                      
Innovative | Postretirement Benefits                                  
Consideration Transferred                                  
Cash-on-hand used to fund the purchase price 27,800                                
Payments for acquisition other postretirement benefit unfunded                           5,100      
Innovative | Term loans                                  
Consideration Transferred                                  
Cash consideration 51,000                                
Debt instrument, face amount $ 60,000                                
Telecommunication Equipment                                  
Purchase price allocation BDC:                                  
Discounted rate used for cash flows   15.00%                              
US Telecom                                  
Consideration Transferred                                  
Cash consideration       $ 9,100                          
Purchase price allocation:                                  
Property, plant and equipment       10,200                          
Goodwill       3,100                          
Deferred tax liability       (3,500)                          
Other long term liabilities       700                          
Increase in goodwill       2,700                          
Increase in deferred tax liabilities       $ 2,700                          
Vibrant Energy                                  
Consideration Transferred                                  
Cash consideration     $ 3,500                            
Total consideration     6,193                            
Purchase price allocation:                                  
Cash     136                            
Prepayments and other assets     636                            
Property, plant and equipment     7,321                            
Goodwill     3,279                            
Accounts payable and accrued liabilities     (5,179)                            
Net assets acquired     6,193                            
Purchase price allocation BDC:                                  
Contingent Consideration     2,700                            
Revenue                           400      
Transaction related charges relating to legal, accounting and consulting services.     $ 11,400                            
Transaction related charges                           $ 10,100      
Minimum                                  
Purchase price allocation BDC:                                  
Useful life                           3 years      
Minimum | Innovative Pension Benefit                                  
Goodwill                                  
Discount rate (as a percent) 3.60%                                
Minimum | Innovative | Income Approach | Non-Controlling Interests                                  
Goodwill                                  
Discount rate (as a percent) 15.00%                                
Minimum | Innovative | Income Approach | Designated as cash flow hedges                                  
Goodwill                                  
Discount rate (as a percent) 14.00%                                
Minimum | Telecommunication Equipment                                  
Purchase price allocation BDC:                                  
Useful life 1 year 3 years                              
Minimum | Telecommunication Equipment | Customer relationships                                  
Purchase price allocation BDC:                                  
Useful life 7 years 9 years                              
Maximum                                  
Purchase price allocation BDC:                                  
Useful life                           39 years      
Maximum | Innovative Pension Benefit                                  
Goodwill                                  
Discount rate (as a percent) 3.90%                                
Maximum | Innovative | Income Approach | Non-Controlling Interests                                  
Goodwill                                  
Discount rate (as a percent) 25.00%                                
Maximum | Innovative | Income Approach | Designated as cash flow hedges                                  
Goodwill                                  
Discount rate (as a percent) 25.00%                                
Maximum | Telecommunication Equipment                                  
Purchase price allocation BDC:                                  
Useful life 18 years 18 years                              
Maximum | Telecommunication Equipment | Customer relationships                                  
Purchase price allocation BDC:                                  
Useful life 13 years 12 years                              
International Telecom                                  
Purchase price allocation:                                  
Goodwill           $ 24,326       $ 5,438       $ 24,326 $ 5,438   $ 5,438
Disposal Group, Disposed of by Sale, Not Discontinued Operations | International Telecom                                  
Purchase price allocation BDC:                                  
Deconsolidation of non-controlling interests         $ 20,000                        
Deconsolidation, Revaluation of Retained Investment, Gain (Loss), Amount         100                        
Nonoperating Income (Expense) | Disposal Group, Disposed of by Sale, Not Discontinued Operations | International Telecom                                  
Purchase price allocation BDC:                                  
Loss on deconsolidation of subsidiary         $ 19,900