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Revenue - Effect of New Accounting Pronouncement on Balance Sheet (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Jan. 01, 2018
Dec. 31, 2017
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]      
Prepaid expenses and other current assets $ 102,349 $ 79,973 $ 73,358
Deferred Set-up Costs, Noncurrent 342,913   282,478
Deferred subscriber acquisition costs, net   315,858  
Other assets 131,988 130,288 123,967
Deferred tax liabilities 1,381,723 1,388,594 1,376,708
Accumulated deficit (1,148,059) (963,782) (998,212)
Calculated under Revenue Guidance in Effect before Topic 606      
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]      
Prepaid expenses and other current assets 95,108   73,358
Deferred subscriber acquisition costs, net 302,947   282,478
Other assets 126,117   123,967
Deferred tax liabilities 1,368,180   1,376,708
Accumulated deficit (1,187,594)   $ (998,212)
Difference between Revenue Guidance in Effect before and after Topic 606 | Accounting Standards Update 2014-09      
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]      
Prepaid expenses and other current assets 7,241 6,615  
Deferred subscriber acquisition costs, net 39,966 33,380  
Other assets 5,871 6,321  
Deferred tax liabilities 13,543 11,886  
Accumulated deficit $ 39,535 $ 34,430