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Condensed Consolidated Statements of Comprehensive Loss (Unaudited) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Statement of Comprehensive Income [Abstract]        
Net loss $ (28,857) $ (75,649) $ (397,538) $ (152,317)
Other Comprehensive Income (Loss), net of tax        
Net unrealized gain on available-for-sale securities 0 391 0 454
Defined benefit plan adjustments 109 (83) 42 (25)
Foreign currency translation gain (loss) 18,988 (29,715) (130) (14,095)
Other Comprehensive Income (Loss), net of tax 19,097 (29,407) (88) (13,666)
Comprehensive Loss, net of tax (9,760) (105,056) (397,626) (165,983)
Less: Comprehensive Income attributable to non-controlling interest, net of tax 2,382 2,561 7,417 4,762
Comprehensive Loss attributable to ADTRAN Holdings, Inc., net of tax $ (12,142) $ (107,617) $ (405,043) $ (170,745)