XML 164 R1.htm IDEA: XBRL DOCUMENT v3.19.3.a.u2
Document and Entity Information - USD ($)
 12 Months Ended
Dec. 31, 2019
Feb. 21, 2020
Jun. 30, 2019
Cover [Abstract]      
Document Type 10-K    
Amendment Flag false    
Document Period End Date Dec. 31, 2019    
Document Fiscal Year Focus 2019    
Document Fiscal Period Focus FY    
Trading Symbol ADTN    
Entity Registrant Name ADTRAN, Inc.    
Entity Central Index Key 0000926282    
Current Fiscal Year End Date --12-31    
Entity Well-known Seasoned Issuer Yes    
Entity Current Reporting Status Yes    
Entity Voluntary Filers No    
Entity Filer Category Large Accelerated Filer    
Entity Shell Company false    
Entity Emerging Growth Company false    
Entity Small Business false    
Entity Common Stock, Shares Outstanding   48,086,618  
Entity Public Float     $ 724,323,806
Entity Interactive Data Current Yes    
Entity File Number 000-24612    
Entity Tax Identification Number 63-0918200    
Entity Address, Address Line One 901 Explorer Boulevard    
Entity Address, City or Town Huntsville    
Entity Address, State or Province AL    
Entity Address, Postal Zip Code 35806-2807    
City Area Code 256    
Local Phone Number 963-8000    
Entity Incorporation, State or Country Code DE    
Document Annual Report true    
Document Transition Report false    
Title of 12(b) Security Common Stock, Par Value $0.01    
Security Exchange Name NASDAQ    
Documents Incorporated by Reference

DOCUMENTS INCORPORATED BY REFERENCE

Portions of the Proxy Statement for the Annual Meeting of Stockholders to be held on May 13, 2020 are incorporated herein by reference in Part III.