Quarterly report pursuant to Section 13 or 15(d)

Acquisition (Narrative) (Details)

v3.10.0.1
Acquisition (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Mar. 09, 2018
Jun. 30, 2018
Jun. 30, 2018
GCI Liberty Inc      
Business Acquisition [Line Items]      
Net earnings (loss) from continuing operations   $ 6,000 $ 4,500
GCI Liberty Inc | HoldCo      
Business Acquisition [Line Items]      
Acquisition price $ 1,100,000    
Intangible assets subject to amortization 503,737    
Acquired goodwill deductible for income tax purposes $ 170,000    
Increase in property and equipment   16,300  
Increase in intangible assets not subject to amortization   9,500  
Decrease to intangible assets subject to amortization   40,200  
Increase in deferred revenue   15,600  
Decrease in other liabilities   21,300  
Increase in goodwill   $ 7,800  
GCI Liberty Inc | Tradename | HoldCo      
Business Acquisition [Line Items]      
Estimated useful life 8 years    
GCI Liberty Inc | Customer relationships | HoldCo      
Business Acquisition [Line Items]      
Weighted average useful life 13 years    
GCI Liberty Inc | Right-to-use | HoldCo      
Business Acquisition [Line Items]      
Weighted average useful life 8 years