Annual report pursuant to Section 13 and 15(d)

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

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Summary of Significant Accounting Policies - Impact of ASUs in the Consolidated Statements of Comprehensive Income (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Revenues                      
Total revenue $ 1,495,908 $ 1,467,383 $ 1,432,299 $ 1,375,102 $ 1,403,898 $ 1,379,596 $ 1,347,569 $ 1,294,066 $ 5,770,692 $ 5,425,129 $ 5,017,220
Expenses                      
Cost of services 572,551 564,735 636,668 534,652 572,405 519,024 513,446 497,107      
Subscriber acquisition costs                 470,336 499,492 512,809
Income tax expense                 (244,681) (616,301) (345,727)
Net income $ 251,052 $ 343,048 $ 292,352 $ 289,441 $ (36,996) $ 275,722 $ 202,109 $ 207,073 1,175,893 647,908 745,933
Impact of Adopting ASU 2014-09 | Adjustments Due to ASU 2014-09                      
Expenses                      
Subscriber acquisition costs                 3,540    
Income tax expense                 (534)    
Net income                 2,571    
Balances Without Adoption of ASU 2014-09                      
Expenses                      
Subscriber acquisition costs                 473,876    
Income tax expense                 (245,215)    
Net income                 1,178,464    
Subscriber revenue                      
Revenues                      
Total revenue                 4,593,803 4,472,522 4,196,852
Subscriber revenue | Impact of Adopting ASU 2014-09 | Adjustments Due to ASU 2014-09                      
Revenues                      
Total revenue                 94,767    
Subscriber revenue | Balances Without Adoption of ASU 2014-09                      
Revenues                      
Total revenue                 4,688,570    
Revenue share and royalties                      
Expenses                      
Cost of services                 1,393,842 $ 1,210,323 $ 1,108,515
Revenue share and royalties | Impact of Adopting ASU 2014-09 | Adjustments Due to ASU 2014-09                      
Expenses                      
Cost of services                 88,122    
Revenue share and royalties | Balances Without Adoption of ASU 2014-09                      
Expenses                      
Cost of services                 $ 1,481,964