Cover - USD ($) $ in Billions	12 Months Ended
	Dec. 31, 2020	Feb. 23, 2021	Jun. 30, 2020
Cover [Abstract]
Document Type	10-K
Document Annual Report	true
Document Period End Date	Dec. 31, 2020
Current Fiscal Year End Date	--12-31
Document Transition Report	false
Entity File Number	000-09881
Entity Registrant Name	SHENANDOAH TELECOMMUNICATIONS COMPANY
Entity Incorporation, State or Country Code	VA
Entity Tax Identification Number	54-1162807
Entity Address, Address Line One	500 Shentel Way
Entity Address, City or Town	Edinburg
Entity Address, State or Province	VA
Entity Address, Postal Zip Code	22824
City Area Code	540
Local Phone Number	984-4141
Title of 12(b) Security	Common Stock (No Par Value)
Trading Symbol	SHEN
Security Exchange Name	NASDAQ
Entity Common Stock, Shares Outstanding		49,932,073
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
ICFR Auditor Attestation Flag	true
Entity Shell Company	false
Entity Public Float			$ 2.4
Documents Incorporated by Reference	Portions of the registrant’s definitive proxy statement relating to its 2021 annual meeting of shareholders (the “2021 Proxy Statement”) are incorporated by reference into Part III of this Annual Report on Form 10-K where indicated.  The 2021 Proxy Statement will be filed with the U.S. Securities and Exchange Commission within 120 days after the end of the fiscal year to which this report relates.
Entity Central Index Key	0000354963
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	FY
Amendment Flag	false