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Revenue from Contracts with Customers Revenue from Contracts with Customers - Amortized and Capitalized Costs (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Capitalized Contract Cost [Roll Forward]
Beginning Balance	$ 11,005	$ 10,091
Contract payments	8,154	6,518
Contract amortization	(4,490)	(5,604)
Ending Balance	$ 14,669	$ 11,005

X

- Definition

Capitalized Contract Cost Payments

+ References

No definition available.

+ Details

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Namespace Prefix:	shen_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Capitalized Contract Cost [Roll Forward]

+ References

No definition available.

+ Details

Name:	shen_CapitalizedContractCostRollForward
Namespace Prefix:	shen_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount of amortization expense for asset recognized from cost incurred to obtain or fulfill contract with customer.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 340
-SubTopic 40
-Section 50
-Paragraph 3
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=68051541&loc=SL49131252-203054

+ Details

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Namespace Prefix:	us-gaap_
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Balance Type:	debit
Period Type:	duration

X

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 340
-SubTopic 40
-Section 50
-Paragraph 3
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=68051541&loc=SL49131252-203054

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Balance Type:	debit
Period Type:	instant