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Other Assets and Accrued Liabilities - Current Assets (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
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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- Definition

SERP Investments, Current

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- Definition

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

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 340
-SubTopic 40
-Section 50
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-Subparagraph (a)
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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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