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Condensed Consolidated Statements of Changes in Equity (Unaudited) - USD ($) shares in Thousands, $ in Thousands | Total | ADVA Optical Networking SE, [Member] | Common Stock [Member] | Common Stock [Member] ADVA Optical Networking SE, [Member] | Additional Paid-In Capital [Member] | Additional Paid-In Capital [Member] ADVA Optical Networking SE, [Member] | Retained Earnings [Member] | Treasury Stock [Member] | Accumulated Other Comprehensive Loss [Member] | Non-controlling Interest [Member] | Non-controlling Interest [Member] ADVA Optical Networking SE, [Member]
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Beginning Balance at Dec. 31, 2020 | $ 372,944 |  | $ 797 |  | $ 281,466 |  | $ 781,813 | $ (679,493) | $ (11,639) |  |
Beginning Balance, Shares at Dec. 31, 2020 |  |  | 79,652 |  |  |  |  |  |  |  |
Net income (loss) | 896 |  |  |  |  |  | 896 |  |  |  |
Other comprehensive income (loss), net of tax | (1,956) |  |  |  |  |  |  |  | (1,956) |  |
Dividend payments ($0.09 per share) | (4,361) |  |  |  |  |  | (4,361) |  |  |  |
Dividends accrued on unvested RSUs | (68) |  |  |  |  |  | (68) |  |  |  |
Deferred compensation adjustments, net of tax | (50) |  |  |  |  |  |  | (50) |  |  |
PSUs, RSUs and restricted stock vested | (81) |  |  |  |  |  | (1,683) | 1,602 |  |  |
Stock options exercised | 1,244 |  |  |  |  |  | (476) | 1,720 |  |  |
Stock-based compensation expense | 1,807 |  |  |  | 1,807 |  |  |  |  |  |
Ending Balance at Mar. 31, 2021 | 370,375 |  | $ 797 |  | 283,273 |  | 776,121 | (676,221) | (13,595) |  |
Ending Balance, Shares at Mar. 31, 2021 |  |  | 79,652 |  |  |  |  |  |  |  |
Beginning Balance at Dec. 31, 2020 | 372,944 |  | $ 797 |  | 281,466 |  | 781,813 | (679,493) | (11,639) |  |
Beginning Balance, Shares at Dec. 31, 2020 |  |  | 79,652 |  |  |  |  |  |  |  |
Net income (loss) | (4,445) |  |  |  |  |  |  |  |  |  |
Other comprehensive income (loss), net of tax | (2,827) |  |  |  |  |  |  |  |  |  |
Ending Balance at Sep. 30, 2021 | 363,753 |  | $ 797 |  | 286,923 |  | 760,398 | (669,899) | (14,466) |  |
Ending Balance, Shares at Sep. 30, 2021 |  |  | 79,652 |  |  |  |  |  |  |  |
Beginning Balance at Mar. 31, 2021 | 370,375 |  | $ 797 |  | 283,273 |  | 776,121 | (676,221) | (13,595) |  |
Beginning Balance, Shares at Mar. 31, 2021 |  |  | 79,652 |  |  |  |  |  |  |  |
Net income (loss) | 5,086 |  |  |  |  |  | 5,086 |  |  |  |
Other comprehensive income (loss), net of tax | 455 |  |  |  |  |  |  |  | 455 |  |
Dividend payments ($0.09 per share) | (4,374) |  |  |  |  |  | (4,374) |  |  |  |
Dividends accrued on unvested RSUs | (128) |  |  |  |  |  | (128) |  |  |  |
Deferred compensation adjustments, net of tax | (12) |  |  |  |  |  |  | (12) |  |  |
PSUs, RSUs and restricted stock vested | (3) |  |  |  |  |  | (32) | 29 |  |  |
Stock options exercised | 2,308 |  |  |  |  |  | (619) | 2,927 |  |  |
Stock-based compensation expense | 1,808 |  |  |  | 1,808 |  |  |  |  |  |
Ending Balance at Jun. 30, 2021 | 375,515 |  | $ 797 |  | 285,081 |  | 776,054 | (673,277) | (13,140) |  |
Ending Balance, Shares at Jun. 30, 2021 |  |  | 79,652 |  |  |  |  |  |  |  |
Net income (loss) | (10,427) |  |  |  |  |  | (10,427) |  |  |  |
Other comprehensive income (loss), net of tax | (1,326) |  |  |  |  |  |  |  | (1,326) |  |
Dividend payments ($0.09 per share) | (4,389) |  |  |  |  |  | (4,389) |  |  |  |
Dividends accrued on unvested RSUs | 2 |  |  |  |  |  | 2 |  |  |  |
Deferred compensation adjustments, net of tax | (12) |  |  |  |  |  |  | (12) |  |  |
PSUs, RSUs and restricted stock vested | (11) |  |  |  |  |  | (185) | 174 |  |  |
Stock options exercised | 2,559 |  |  |  |  |  | (657) | 3,216 |  |  |
Stock-based compensation expense | 1,842 |  |  |  | 1,842 |  |  |  |  |  |
Ending Balance at Sep. 30, 2021 | 363,753 |  | $ 797 |  | 286,923 |  | 760,398 | (669,899) | (14,466) |  |
Ending Balance, Shares at Sep. 30, 2021 |  |  | 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 |  | 79,652 |  |  |  |  |  |  |  |
Net income (loss) | $ (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) |  |  |
PSUs, RSUs and restricted stock vested | (54) |  |  |  |  |  | (895) | 841 |  |  |
Stock options exercised | 568 |  |  |  |  |  | (143) | 711 |  |  |
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 |  | 79,652 |  |  |  |  |  |  |  |
Net income (loss) | $ (43,843) |  |  |  |  |  |  |  |  |  |
Other comprehensive income (loss), net of tax | $ (28,468) |  |  |  |  |  |  |  |  |  |
Stock options exercised, Shares | 439 |  |  |  |  |  |  |  |  |  |
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 |  | 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 income (loss) | 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 |  |  |
PSUs, RSUs and restricted stock vested | (300) |  |  |  |  |  | (90) | (210) |  |  |
Stock options exercised | 68 |  |  |  |  |  | (19) | 87 |  |  |
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 income (loss) | (44,859) |  |  |  |  |  | (41,934) |  |  | (2,925) |
Acquisition of ADVA |  | $ 894,675 |  | $ 280 |  | $ 577,980 |  |  |  |  | $ 316,415
Acquisition of ADVA, 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) |  |  |
PSUs, RSUs and restricted stock vested | (40) |  |  |  |  |  | (40) |  |  |  |
PSUs, RSUs and restricted stock vested, Shares |  |  | 4 |  |  |  |  |  |  |  |
Stock options exercised | 4,433 | 365 | $ 2 |  |  | 236 | 4,431 |  |  |  | 129
Stock options exercised, Shares |  |  | 298 |  |  |  |  |  |  |  |
Stock-based compensation expense | 11,195 | $ 938 |  |  | 11,195 | $ 885 |  |  |  |  | $ 53
Reclassification of ADVA 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 |  | 77,619 |  |  |  |  |  |  |  |

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