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Long-Term Debt - Financial Covenants in Credit Agreements (Details) |  | 12 Months Ended
--- | --- | ---
Dec. 18, 2015 USD ($) | Dec. 31, 2019 USD ($)
Debt Disclosure [Abstract] |  |
Total leverage ratio, actual |  | 2.4
Debt service coverage ratio, actual |  | 5.8
Minimum liquidity balance, actual |  | $ 176,400,000
Total Leverage Ratio |  | 3.50
Debt Service Coverage Ratio |  | 2.00
Minimum liquidity balance | $ 25,000,000 | $ 25,000,000

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- Definition Debt Instrument, Covenant, Liquidity Balance, Actual + References No definition available. + Details
Name: | shen_DebtInstrumentCovenantLiquidityBalanceActual
Namespace Prefix: | shen_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Represents the minimum liquidity balance, defined as availability under the revolver facility plus unrestricted cash and cash equivalents on deposit in a deposit account for which a control agreement has been delivered to the administrative agent. + References No definition available. + Details
Name: | shen_DebtInstrumentCovenantsMinimumLiquidityAmount
Namespace Prefix: | shen_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Represents actual debt service coverage ratio. + References No definition available. + Details
Name: | shen_DebtServiceCoverageRatioActual
Namespace Prefix: | shen_
Data Type: | xbrli:pureItemType
Balance Type: | na
Period Type: | instant

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- Definition Represents actual leverage ratio. + References No definition available. + Details
Name: | shen_LeverageRatioActual
Namespace Prefix: | shen_
Data Type: | xbrli:pureItemType
Balance Type: | na
Period Type: | instant

X
- Definition Ratio of EBITDA divided by sum of all scheduled principal payments on Term Loans and regularly scheduled principal payments on other indebtedness plus cash interest. + References No definition available. + Details
Name: | shen_MinimumDebtServiceCoverageRatio
Namespace Prefix: | shen_
Data Type: | xbrli:pureItemType
Balance Type: | na
Period Type: | duration

X
- Definition Ratio of indebtedness to earnings before interest, taxes, depreciation and amortization. + References No definition available. + Details
Name: | shen_RatioOfIndebtednessToEbitda
Namespace Prefix: | shen_
Data Type: | xbrli:pureItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_DebtDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration