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Commitments and Contingencies (Annual Minimum Tower Lease Income) (Details) $ in Thousands | Dec. 31, 2018 USD ($)
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Commitments and Contingencies [Abstract] |
2019 | $ 1,529,902
2020 | 1,326,108
2021 | 1,075,675
2022 | 815,219
2023 | $ 598,987

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