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Related Party Transactions - Schedule of Related Party Revenue and Other Income (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Other income        
Share of net earnings     $ (2,065) $ 7,541
Sirius XM Canada | Equity Method Investee        
Related Party Transaction [Line Items]        
Revenue $ 24,606 $ 23,141 71,976 63,486
Other income        
Share of net earnings 1,034 9,725 1,119 7,542
Interest income $ 2,553 $ 2,718 $ 7,757 $ 3,521