Quarterly report pursuant to Section 13 or 15(d)

Acquisition (Narrative) (Details)

v3.8.0.1
Acquisition (Narrative) (Details) - USD ($)
$ in Thousands
1 Months Ended
Mar. 09, 2018
Mar. 31, 2018
GCI Liberty Inc    
Business Acquisition [Line Items]    
Net earnings (loss) from continuing operations   $ 1,500
GCI Liberty Inc | HoldCo    
Business Acquisition [Line Items]    
Acquisition price $ 1,100,000  
Intangible assets subject to amortization 543,905  
Acquired goodwill deductible for income tax purposes $ 170,000  
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