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Other Assets and Accrued Liabilities - Current Assets (Details) - USD ($) $ in Thousands | Mar. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Other Liabilities Disclosure [Abstract] |  |
Deposit for FCC spectrum licenses | $ 16,118 | $ 16,118
Prepaid maintenance and software expenses | 4,961 | 8,391
Broadband contract acquisition costs | 2,610 | 2,502
SERP investments | 801 | 801
Other | 2,153 | 2,018
Prepaid expenses and other | $ 26,643 | $ 29,830

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