Annual report pursuant to Section 13 and 15(d)

Investments in Charter Accounted for Using the Equity Method (Details)

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Investments in Charter Accounted for Using the Equity Method (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Investments in affiliates accounted for using the Equity Method    
Carrying value of equity method investment $ 12,194,674 $ 12,004,376
Charter    
Investments in affiliates accounted for using the Equity Method    
Carrying value of equity method investment 12,195,000  
Market value of equity method investment $ 26,229,000  
Ownership percentage 26.00%  
Business Acquisition, Percentage of Voting Interests Acquired 25.01%  
A/N | Charter    
Investments in affiliates accounted for using the Equity Method    
Proxy agreement term 5 years  
Trading days before proposed sale of A/N 2 days  
first | A/N | Charter    
Investments in affiliates accounted for using the Equity Method    
Maximum percentage of New Charter shares that may be voted by proxy 7.00%  
last | A/N | Charter    
Investments in affiliates accounted for using the Equity Method    
Maximum percentage of New Charter shares that may be voted by proxy 7.00%