Quarterly report pursuant to Section 13 or 15(d)

Summary of Significant Accounting Policies - Impact of ASUs in the Unaudited Consolidated Statements of Comprehensive Income (Details)

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Summary of Significant Accounting Policies - Impact of ASUs in the Unaudited Consolidated Statements of Comprehensive Income (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Revenues        
Total revenue $ 1,467,383 $ 1,379,596 $ 4,274,784 $ 4,021,231
Expenses        
Subscriber acquisition costs 109,469 119,555 351,940 372,197
Income tax expense (11,525) (108,901) (162,344) (342,387)
Net income 343,048 275,722 924,841 684,904
Impact of Adopting ASU 2014-09 | Adjustments Due to ASU 2014-09        
Expenses        
Subscriber acquisition costs 902   2,748  
Income tax expense (15)   (371)  
Net income 443   2,116  
Balances Without Adoption of ASUs        
Expenses        
Subscriber acquisition costs 110,371   354,688  
Income tax expense (11,540)   (162,715)  
Net income 343,491   926,957  
Subscriber revenue        
Revenues        
Total revenue 1,162,439 1,136,027 3,418,485 3,325,295
Subscriber revenue | Impact of Adopting ASU 2014-09 | Adjustments Due to ASU 2014-09        
Revenues        
Total revenue 24,103   72,282  
Subscriber revenue | Balances Without Adoption of ASUs        
Revenues        
Total revenue 1,186,542   3,490,767  
Revenue share and royalties        
Expenses        
Cost of services 343,015 $ 296,498 1,057,431 $ 866,691
Revenue share and royalties | Impact of Adopting ASU 2014-09 | Adjustments Due to ASU 2014-09        
Expenses        
Cost of services 22,743   67,047  
Revenue share and royalties | Balances Without Adoption of ASUs        
Expenses        
Cost of services $ 365,758   $ 1,124,478