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Other Assets and Accrued Liabilities - Current Assets (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Other Liabilities Disclosure [Abstract]
Prepaid maintenance expenses	$ 6,913	$ 4,018
Broadband contract acquisition and fulfillment costs	4,100	4,417
SERP investments	844	0
Other	1,328	1,196
Prepaid expenses and other	$ 13,185	$ 9,631

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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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-Name Accounting Standards Codification
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-SubTopic 40
-Section 50
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Amount of current assets classified as other.

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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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