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Commitments and Contingencies - Universal Services Fund Liability (Details) - USD ($)
1 Months Ended 3 Months Ended 12 Months Ended
Jul. 31, 2013
Dec. 31, 2016
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Jun. 30, 2015
Jun. 12, 2015
Sep. 30, 2014
Dec. 31, 2012
Loss Contingencies [Line Items]                  
Accrued federal fees   $ 2,742,000 $ 2,742,000 $ 5,684,000          
Reversal of accrued federal fees   3,100,000 3,114,000 0 $ 0        
Promissory note payable   33,714,000 33,714,000            
FCC Enforcement Bureau Civil Penalty                  
Loss Contingencies [Line Items]                  
Accrued liability for civil penalty               $ 2,000,000  
General and Administrative                  
Loss Contingencies [Line Items]                  
interest and penalty expense     600,000 500,000 $ 500,000        
2003 through 2012 | USF Obligations                  
Loss Contingencies [Line Items]                  
Accrued federal fees                 $ 8,100,000
Undisputed portion [Member] | 2003 through 2012 | USF Obligations                  
Loss Contingencies [Line Items]                  
Accrued federal fees                 4,700,000
Payments for state and local taxes on usage-based fees $ 600,000                
Disputed portion [Member] | 2003 through 2012 | USF Obligations                  
Loss Contingencies [Line Items]                  
Accrued federal fees   2,500,000 2,500,000 4,900,000         3,400,000
Disputed portion [Member] | 2003 through 2007 | USF Obligations                  
Loss Contingencies [Line Items]                  
Accrued federal fees                 $ 800,000
Promissory Note to USAC | USF Obligations                  
Loss Contingencies [Line Items]                  
Promissory note issued $ 4,100,000.0                
FCC Enforcement Bureau Civil Penalty                  
Loss Contingencies [Line Items]                  
Civil penalty             $ 2,000,000    
Notes Payable                  
Loss Contingencies [Line Items]                  
Promissory note payable   1,120,000 1,120,000 25,626,000          
Notes Payable | Promissory Note to USAC                  
Loss Contingencies [Line Items]                  
Promissory note payable   120,000 120,000 1,459,000          
Notes Payable | FCC Enforcement Bureau Civil Penalty                  
Loss Contingencies [Line Items]                  
Promissory note payable   $ 1,000,000 $ 1,000,000 $ 1,667,000          
Civil penalty           $ 2,000,000