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Commitments and Contingencies - Additional Information (Details) |  |  | 3 Months Ended
--- | --- | --- | ---
Jan. 31, 2019 USD ($) | Mar. 13, 2017 USD ($) | Mar. 31, 2019 USD ($) satellite
Loss Contingencies [Line Items] |  |  |
Number of replacement satellites | satellite |  |  | 2
Telephone Consumer Protection Act Suits |  |  |
Loss Contingencies [Line Items] |  |  |
Litigation Settlement, Amount Awarded from Other Party | $ 25,000,000 |  |
Litigation Settlement, Amount Awarded To Other Party, Subscription, Term |  |  | 3 months
Telephone Consumer Protection Act Suits | Pending Litigation |  |  |
Loss Contingencies [Line Items] |  |  |
Damages sought per violation |  | $ 500 |
Surety Bond |  |  |
Loss Contingencies [Line Items] |  |  |
Estimate of possible loss |  |  | $ 45,000,000
Maximum |  |  |
Loss Contingencies [Line Items] |  |  |
Operating lease obligations, term (years) |  |  | 15 years
Maximum | Telephone Consumer Protection Act Suits | Pending Litigation |  |  |
Loss Contingencies [Line Items] |  |  |
Damages sought per willful violation |  | $ 1,500 |
Minimum |  |  |
Loss Contingencies [Line Items] |  |  |
Operating lease obligations, term (years) |  |  | 1 year
XM-5, FM-5, FM-6, XM-3, and XM-4 |  |  |
Loss Contingencies [Line Items] |  |  |
Operating performance over design life |  |  | 15 years
XM-4 |  |  |
Loss Contingencies [Line Items] |  |  |
Period beyond expected operating performance of design life for XM-4 |  |  | 5 years
XM-4 | Maximum |  |  |
Loss Contingencies [Line Items] |  |  |
Additional payments required if XM-4 continues to operate above baseline specifications |  |  | $ 10,000,000
Advertising sales commitments |  |  |
Loss Contingencies [Line Items] |  |  |
Future minimum guarantee payments |  |  | 50,000,000
Minimum guarantee payments due in remainder of 2019 |  |  | 15,000,000
Royalty Arrangement |  |  |
Loss Contingencies [Line Items] |  |  |
Prepayments made of minimum guarantee payments |  |  | 11,000,000
Future minimum guarantee payments |  |  | 250,000,000
Minimum guarantee payments due in remainder of 2019 |  |  | $ 189,000,000

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