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Revenue from Contracts with Customers Revenue from Contracts with Customers - Amortized and Capitalized Costs (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
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Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Capitalized Contract Cost [Roll Forward] |  |  |  |
Beginning Balance | $ 15,215 | $ 11,663 | $ 14,669 | $ 11,005
Contract payments | 1,410 | 2,248 | 3,215 | 3,933
Contract amortization | (1,335) | (1,131) | (2,594) | (2,158)
Ending Balance | $ 15,290 | $ 12,780 | $ 15,290 | $ 12,780

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- Definition Capitalized Contract Cost Payments + References No definition available. + Details
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Namespace Prefix: | shen_
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Balance Type: | credit
Period Type: | duration

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- Definition Capitalized Contract Cost [Roll Forward] + References No definition available. + Details
Name: | shen_CapitalizedContractCostRollForward
Namespace Prefix: | shen_
Data Type: | xbrli:stringItemType
Balance Type: | na
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- 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=123353750&loc=SL49131252-203054 + Details
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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. + 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=123353750&loc=SL49131252-203054 + Details
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Period Type: | instant