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Other Assets and Accrued Liabilities - Current Assets (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
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Other Liabilities Disclosure [Abstract] |  |
Prepaid maintenance expenses | $ 8,665 | $ 4,018
Broadband contract acquisition and fulfillment costs | 4,426 | 4,417
SERP investments | 862 | 0
Other | 2,510 | 1,196
Prepaid expenses and other | $ 16,463 | $ 9,631

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