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Consolidated Statements of Comprehensive Income (Loss) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Statement of Comprehensive Income [Abstract]      
Net (Loss) Income $ (8,888) $ (8,635) $ 2,378
Other Comprehensive Income (Loss), net of tax      
Net unrealized (loss) gain on available-for-sale securities (284) (584) 316
Defined benefit plan adjustments 4,597 4,008 (395)
Foreign currency translation gain (loss) 53,396 (3,699) 4,857
Other Comprehensive (loss) Income, net of tax 57,709 (275) 4,778
Less: Comprehensive Loss attributable to non-controlling interest, net of tax (918)    
Comprehensive Income (Loss) attributable to ADTRAN Holdings, Inc., net of tax $ 49,739 $ (8,910) $ 7,156