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Goodwill, Regulatory Authorizations and Other Intangible Assets - Future Amortization of Intangible Assets (Details)
$ in Thousands
Dec. 31, 2018
USD ($)
Estimated future amortization of intangible assets  
2019 $ 18,304
2020 14,663
2021 8,029
2022 5,065
2023 5,065
Thereafter 23,102
Total $ 74,228