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Condensed Consolidated Statements of Changes in Equity (Unaudited) - USD ($) shares in Thousands, $ in Thousands | Total | Adtran Networks SE [Member] | Common Stock [Member] | Common Stock [Member] Adtran Networks SE [Member] | Additional Paid-in Capital [Member] | Additional Paid-in Capital [Member] Adtran Networks SE [Member] | Retained (Deficit) Earnings [Member] | Treasury Stock [Member] | Accumulated Other Comprehensive Income (Loss) [Member] | Non-controlling Interest [Member] | Non-controlling Interest [Member] Adtran Networks SE [Member]
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Beginning Balance at Dec. 31, 2021 | $ 357,102 |  | $ 797 |  | $ 288,946 |  | $ 740,820 | $ (661,547) | $ (11,914) |  |
Beginning Balance, Shares at Dec. 31, 2021 |  |  | 79,652 |  |  |  |  |  |  |  |
Net (loss) income | (1,127) |  |  |  |  |  | (1,127) |  |  |  |
Other comprehensive income (loss), net of tax | (1,642) |  |  |  |  |  |  |  | (1,642) |  |
Dividend payments ($0.09 per share) | (4,438) |  |  |  |  |  | (4,438) |  |  |  |
Dividends accrued on unvested RSUs | 32 |  |  |  |  |  | 32 |  |  |  |
Deferred compensation adjustments, net of tax | (18) |  |  |  |  |  |  | (18) |  |  |
ADTRAN RSUs, PSUs, RSUs and restricted stock vested | (54) |  |  |  |  |  | (895) | 841 |  |  |
ADTRAN Stock options exercised | 568 |  |  |  |  |  | (143) | 711 |  |  |
ADTRAN Stock-based compensation expense | 1,893 |  |  |  | 1,893 |  |  |  |  |  |
Ending Balance at Mar. 31, 2022 | 352,316 |  | $ 797 |  | 290,839 |  | 734,249 | (660,013) | (13,556) |  |
Ending Balance, Shares at Mar. 31, 2022 |  |  | 79,652 |  |  |  |  |  |  |  |
Beginning Balance at Dec. 31, 2021 | 357,102 |  | $ 797 |  | 288,946 |  | 740,820 | (661,547) | (11,914) |  |
Beginning Balance, Shares at Dec. 31, 2021 |  |  | 79,652 |  |  |  |  |  |  |  |
Other comprehensive income (loss), net of tax | (28,468) |  |  |  |  |  |  |  |  |  |
Ending Balance at Sep. 30, 2022 | 1,184,827 |  | $ 776 |  | 883,210 |  | 31,535 | (4,083) | (40,288) | $ 313,677 |
Ending Balance, Shares at Sep. 30, 2022 |  |  | 77,619 |  |  |  |  |  |  |  |
Beginning Balance at Mar. 31, 2022 | 352,316 |  | $ 797 |  | 290,839 |  | 734,249 | (660,013) | (13,556) |  |
Beginning Balance, Shares at Mar. 31, 2022 |  |  | 79,652 |  |  |  |  |  |  |  |
Net (loss) income | 2,143 |  |  |  |  |  | 2,143 |  |  |  |
Other comprehensive income (loss), net of tax | (3,140) |  |  |  |  |  |  |  | (3,140) |  |
Dividend payments ($0.09 per share) | (4,439) |  |  |  |  |  | (4,439) |  |  |  |
Dividends accrued on unvested RSUs | (23) |  |  |  |  |  | (23) |  |  |  |
Deferred compensation adjustments, net of tax | 24 |  |  |  |  |  |  | 24 |  |  |
ADTRAN RSUs, PSUs, RSUs and restricted stock vested | (300) |  |  |  |  |  | (90) | (210) |  |  |
ADTRAN Stock options exercised | 68 |  |  |  |  |  | (19) | 87 |  |  |
ADTRAN Stock-based compensation expense | 1,888 |  |  |  | 1,888 |  |  |  |  |  |
Ending Balance at Jun. 30, 2022 | 348,537 |  | $ 797 |  | 292,727 |  | 731,821 | (660,112) | (16,696) |  |
Ending Balance, Shares at Jun. 30, 2022 |  |  | 79,652 |  |  |  |  |  |  |  |
Net (loss) income | (44,859) |  |  |  |  |  | (41,934) |  |  | (2,925) |
Acquisition of Adtran Networks |  | $ 894,675 |  | $ 280 |  | $ 577,980 |  |  |  |  | $ 316,415
Acquisition of Adtran Networks, Shares |  |  |  | 27,995 |  |  |  |  |  |  |
Retirement of treasury stock |  |  | $ (303) |  |  |  | (655,761) | 656,064 |  |  |
Retirement of treasury stock, Shares |  |  | (30,330) |  |  |  |  |  |  |  |
Other comprehensive income (loss), net of tax | (23,686) |  |  |  |  |  |  |  | (23,592) | (94) |
Dividend payments ($0.09 per share) | (6,982) |  |  |  |  |  | (6,982) |  |  |  |
Deferred compensation adjustments, net of tax | (35) |  |  |  |  |  |  | (35) |  |  |
ADTRAN RSUs, PSUs, RSUs and restricted stock vested | (40) |  |  |  |  |  | (40) |  |  |  |
ADTRAN RSUs, PSUs, RSUs and restricted stock vested, Shares |  |  | 4 |  |  |  |  |  |  |  |
ADTRAN Stock options exercised | 4,433 | 365 | $ 2 |  |  | 236 | 4,431 |  |  |  | 129
ADTRAN Stock options exercised, Shares |  |  | 298 |  |  |  |  |  |  |  |
ADTRAN Stock-based compensation expense | 11,195 | 938 |  |  | 11,195 | 885 |  |  |  |  | 53
Reclassification of Adtran Networks stock options | 286 |  |  |  | 187 |  |  |  |  | 99 |
Ending Balance at Sep. 30, 2022 | 1,184,827 |  | $ 776 |  | 883,210 |  | 31,535 | (4,083) | (40,288) | 313,677 |
Ending Balance, Shares at Sep. 30, 2022 |  |  | 77,619 |  |  |  |  |  |  |  |
Beginning Balance at Dec. 31, 2022 | $ 1,303,613 |  | $ 781 |  | 895,834 |  | 55,338 | (4,125) | 46,713 | 309,072 |
Beginning Balance, Shares at Dec. 31, 2022 | 78,088 |  | 78,088 |  |  |  |  |  |  |  |
Net (loss) income | $ (40,453) |  |  |  |  |  | (37,274) |  |  | (3,179) |
Reclassification and remeasurement from equity to mezzanine equity for non-controlling interests in Adtran Networks | (443,757) |  |  |  |  | (137,620) |  |  |  |  | $ (306,137)
Other comprehensive income (loss), net of tax | 8,782 |  |  |  |  |  |  |  | 8,538 | 244 |
Dividend payments ($0.09 per share) | (7,076) |  |  |  |  |  | (7,076) |  |  |  |
Deferred compensation adjustments, net of tax | (1,792) |  |  |  |  |  |  | (1,792) |  |  |
ADTRAN RSUs, PSUs, RSUs and restricted stock vested | (138) |  | $ 6 |  |  |  | (144) |  |  |  |
ADTRAN RSUs, PSUs, RSUs and restricted stock vested, Shares |  |  | 561 |  |  |  |  |  |  |  |
ADTRAN Stock options exercised | 58 |  |  |  |  |  | 58 |  |  |  |
ADTRAN Stock options exercised, Shares |  |  | 6 |  |  |  |  |  |  |  |
ADTRAN Stock-based compensation expense | 3,812 | $ 9 |  |  | 3,812 | 9 |  |  |  |  |
Redemption of redeemable non-controlling interest | 343 |  |  |  |  |  | 343 |  |  |  |
Foreign currency remeasurement of redeemable non-controlling interest | (430) |  |  |  |  |  | (430) |  |  |  |
Annual recurring compensation earned | (2,809) |  |  |  |  |  | (2,809) |  |  |  |
Ending Balance at Mar. 31, 2023 | 820,162 |  | $ 787 |  | 762,035 |  | 8,006 | (5,917) | 55,251 |  |
Ending Balance, Shares at Mar. 31, 2023 |  |  | 78,655 |  |  |  |  |  |  |  |
Beginning Balance at Dec. 31, 2022 | $ 1,303,613 |  | $ 781 |  | 895,834 |  | 55,338 | (4,125) | 46,713 | $ 309,072 |
Beginning Balance, Shares at Dec. 31, 2022 | 78,088 |  | 78,088 |  |  |  |  |  |  |  |
Other comprehensive income (loss), net of tax | $ (13,669) |  |  |  |  |  |  |  |  |  |
ADTRAN Stock options exercised, Shares | 8 | 13 |  |  |  |  |  |  |  |  |
Ending Balance at Sep. 30, 2023 | $ 684,893 |  | $ 787 |  | 770,565 |  | (113,289) | (5,970) | 32,800 |  |
Ending Balance, Shares at Sep. 30, 2023 | 78,688 |  | 78,688 |  |  |  |  |  |  |  |
Beginning Balance at Mar. 31, 2023 | $ 820,162 |  | $ 787 |  | 762,035 |  | 8,006 | (5,917) | 55,251 |  |
Beginning Balance, Shares at Mar. 31, 2023 |  |  | 78,655 |  |  |  |  |  |  |  |
Net (loss) income | (36,215) |  |  |  |  |  | (36,215) |  |  |  |
Other comprehensive income (loss), net of tax | 6,957 |  |  |  |  |  |  |  | 6,957 |  |
Dividend payments ($0.09 per share) | (7,076) |  |  |  |  |  | (7,076) |  |  |  |
Dividends accrued for RSUs | 9 |  |  |  |  |  | 9 |  |  |  |
Deferred compensation adjustments, net of tax | (26) |  |  |  |  |  |  | (26) |  |  |
ADTRAN RSUs, PSUs, RSUs and restricted stock vested | (44) |  |  |  |  |  | (44) |  |  |  |
ADTRAN RSUs, PSUs, RSUs and restricted stock vested, Shares |  |  | 6 |  |  |  |  |  |  |  |
ADTRAN Stock options exercised |  | $ 92 |  |  |  | 92 |  |  |  |  |
ADTRAN Stock-based compensation expense | 4,291 | 10 |  |  | 4,291 | 10 |  |  |  |  |
Redemption of redeemable non-controlling interest | 6 |  |  |  |  |  | 6 |  |  |  |
Foreign currency remeasurement of redeemable non-controlling interest | (2,814) |  |  |  |  |  | (2,814) |  |  |  |
Annual recurring compensation earned | (2,882) |  |  |  |  |  | (2,882) |  |  |  |
Ending Balance at Jun. 30, 2023 | 782,470 |  | $ 787 |  | 766,428 |  | (41,010) | (5,943) | 62,208 |  |
Ending Balance, Shares at Jun. 30, 2023 |  |  | 78,661 |  |  |  |  |  |  |  |
Net (loss) income | (75,649) |  |  |  |  |  | (75,649) |  |  |  |
Other comprehensive income (loss), net of tax | (29,408) |  |  |  |  |  |  |  | (29,408) |  |
Dividend payments ($0.09 per share) | (7,085) |  |  |  |  |  | (7,085) |  |  |  |
Dividends accrued for RSUs | (8) |  |  |  |  |  | (8) |  |  |  |
Deferred compensation adjustments, net of tax | (27) |  |  |  |  |  |  | (27) |  |  |
ADTRAN RSUs, PSUs, RSUs and restricted stock vested | (175) |  |  |  |  |  | (175) |  |  |  |
ADTRAN RSUs, PSUs, RSUs and restricted stock vested, Shares |  |  | 25 |  |  |  |  |  |  |  |
ADTRAN Stock options exercised | 15 | 8 |  |  |  | 8 | 15 |  |  |  |
ADTRAN Stock options exercised, Shares |  |  | 2 |  |  |  |  |  |  |  |
ADTRAN Stock-based compensation expense | 4,126 | $ 3 |  |  | 4,126 | $ 3 |  |  |  |  |
Redemption of redeemable non-controlling interest | 2 |  |  |  |  |  | 2 |  |  |  |
Foreign currency remeasurement of redeemable non-controlling interest | 13,535 |  |  |  |  |  | 13,535 |  |  |  |
Annual recurring compensation earned | (2,914) |  |  |  |  |  | (2,914) |  |  |  |
Ending Balance at Sep. 30, 2023 | $ 684,893 |  | $ 787 |  | $ 770,565 |  | $ (113,289) | $ (5,970) | $ 32,800 |  |
Ending Balance, Shares at Sep. 30, 2023 | 78,688 |  | 78,688 |  |  |  |  |  |  |  |

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