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Cover - USD ($)
$ in Billions
 12 Months Ended
Dec. 31, 2019
Feb. 19, 2020
Jun. 30, 2019
Cover page.      
Document Type 10-K    
Document Annual Report true    
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   49,783,639  
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    
Entity Shell Company false    
Entity Public Float     $ 1.8
Documents Incorporated by Reference
Portions of the registrant’s definitive proxy statement relating to its 2020 annual meeting of shareholders (the “2020 Proxy Statement”) are incorporated by reference into Part III of this Annual Report on Form 10-K where indicated.  The 2020 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    
Current Fiscal Year End Date --12-31    
Document Period End Date Dec. 31, 2019    
Document Fiscal Year Focus 2019    
Document Fiscal Period Focus FY    
Amendment Flag false