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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, 2019
Dec. 31, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]    
Revenue from Contract with Customer, Term of Customer Relationship 15 years  
Gross carrying amount $ 4,599,997 $ 4,304,279
Accumulated depreciation (1,670,485) (1,396,578)
Subscriber system assets, net $ 2,929,512 $ 2,907,701