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]
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