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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, 2021
Dec. 31, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]    
Revenue from Contract with Customer, Term of Customer Relationship 15 years  
Gross carrying amount $ 5,148,559 $ 4,815,286
Accumulated depreciation (2,386,962) (2,152,058)
Subscriber system assets, net $ 2,761,597 $ 2,663,228