Annual report pursuant to Section 13 and 15(d)

Commitments and Contingencies (Rural Health Care Program) (Details)

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Commitments and Contingencies (Rural Health Care Program) (Details)
 1 Months Ended 3 Months Ended 12 Months Ended
Oct. 10, 2018
USD ($)
Nov. 30, 2017
contract
Dec. 31, 2019
USD ($)
Sep. 30, 2019
USD ($)
Jun. 30, 2019
USD ($)
Mar. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Sep. 30, 2018
USD ($)
Jun. 30, 2018
USD ($)
Mar. 31, 2018
USD ($)
Jun. 30, 2020
USD ($)
Dec. 31, 2019
USD ($)
Jun. 30, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Feb. 19, 2020
USD ($)
Loss Contingencies [Line Items]                                
Net accounts receivables     $ 246,900,000       $ 198,800,000         $ 246,900,000   $ 198,800,000    
Accounts and other receivables, net, current     114,435,000       182,600,000         114,435,000   182,600,000    
Revenue from contract     232,387,000 $ 227,044,000 $ 217,566,000 $ 217,736,000 $ 234,922,000 $ 210,146,000 $ 233,490,000 $ 61,204,000   $ 894,733,000   $ 739,762,000 $ 23,817,000  
RHC Customers                                
Loss Contingencies [Line Items]                                
Loss on contracts     $ 17,000,000.0                          
GCI Holdings | Reduction in Rural Rates Charged to RHC Customers | RHC Customers                                
Loss Contingencies [Line Items]                                
Reduction in rural rates (as a percent) 26.00%                              
Reduction in program support payment $ 27,800,000                              
Reduction in receivables               19,100,000                
Revenues               $ 8,600,000                
Expected reduction in program revenue                         $ 7,000,000.0      
Number of service contracts | contract   2                            
GCI Holdings | Customer                                
Loss Contingencies [Line Items]                                
Number of contracts     2                 2        
Accounts and other receivables, net, current     $ 21,300,000     $ 21,300,000           $ 21,300,000        
Revenue from contract                       12,000,000        
Subsequent Event | GCI Holdings | Customer                                
Loss Contingencies [Line Items]                                
Accounts and other receivables, net, current                               $ 21,300,000
Subsequent Event | Forecast | GCI Holdings | Reduction in Rural Rates Charged to RHC Customers | RHC Customers                                
Loss Contingencies [Line Items]                                
Expected reduction in program revenue                     $ 8,000,000          
Other Assets | RHC Customers                                
Loss Contingencies [Line Items]                                
Net accounts receivables     118,800,000                 118,800,000        
Trade Accounts Receivable | RHC Customers                                
Loss Contingencies [Line Items]                                
Net accounts receivables     12,000,000.0                 12,000,000.0        
Minimum | RHC Customers                                
Loss Contingencies [Line Items]                                
Additional loss on contract     0                 0        
Maximum | RHC Customers                                
Loss Contingencies [Line Items]                                
Additional loss on contract     $ 44,000,000.0                 $ 44,000,000.0