Revenue - Assets Recognized for Costs to Obtain a Contract with a Customer (Details) |
Dec. 31, 2019 |
|---|---|
| Capitalized commission fees | Minimum | |
| Assets Recognized for Costs to Obtain a Contract with a Customer | |
| Amortization period | 2 years |
| Capitalized commission fees | Maximum | |
| Assets Recognized for Costs to Obtain a Contract with a Customer | |
| Amortization period | 10 years |
| Capitalized transmitter costs | Minimum | |
| Assets Recognized for Costs to Obtain a Contract with a Customer | |
| Amortization period | 8 years |
| Capitalized transmitter costs | Maximum | |
| Assets Recognized for Costs to Obtain a Contract with a Customer | |
| Amortization period | 10 years |