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Basis of Presentation and Summary of Significant Accounting Policies - Subscriber System Assets (Details) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2020
Dec. 31, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]    
Revenue from Contract with Customer, Term of Customer Relationship 15 years  
Gross carrying amount $ 4,553,515 $ 4,597,908
Accumulated depreciation (1,919,631) (1,858,612)
Subscriber system assets, net $ 2,633,884 $ 2,739,296