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Other Assets and Accrued Liabilities - Current Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Other Liabilities Disclosure [Abstract]
FCC spectrum license obligations	$ 16,118	$ 0
Prepaid maintenance expenses	8,391	4,018
Broadband contract acquisition costs	2,502	2,308
SERP Investments, Current	801	0
Other	2,018	1,196
Prepaid expenses and other	$ 29,830	$ 7,522	$ 8,668

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Amount, after accumulated amortization and accumulated impairment loss, of asset recognized from cost incurred to obtain or fulfill contract with customer; classified as current.

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Amount of asset related to consideration paid in advance for costs that provide economic benefits in future periods, and amount of other assets that are expected to be realized or consumed within one year or the normal operating cycle, if longer.

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