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Goodwill and Intangible Assets - Schedule of Goodwill (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Goodwill [Roll Forward]
Beginning Balance	$ 731,691	$ 732,752
Acquired goodwill	0	1,025
Impairment loss recognized	(61,661)	(4,879)
Transfer of goodwill between segments	0	0
Disposition	(7,074)
Foreign currency translation	5,255	2,793
Ending Balance	668,211	731,691
Integrated Networks - Group A
Goodwill [Roll Forward]
Beginning Balance	134,573	139,452
Acquired goodwill	0	0
Impairment loss recognized	0	(4,879)
Transfer of goodwill between segments	0	0
Disposition	0
Foreign currency translation	0	0
Ending Balance	134,573	134,573
Integrated Networks - Group B
Goodwill [Roll Forward]
Beginning Balance	268,387	267,059
Acquired goodwill	0	1,025
Impairment loss recognized	(16,137)	0
Transfer of goodwill between segments	19,696	(120)
Disposition	0
Foreign currency translation	212	423
Ending Balance	272,158	268,387
Media & Data Network
Goodwill [Roll Forward]
Beginning Balance	105,597	101,768
Acquired goodwill	0	0
Impairment loss recognized	(5,287)	0
Transfer of goodwill between segments	4,546	3,612
Disposition	0
Foreign currency translation	538	217
Ending Balance	105,394	105,597
All Other [Domain]
Goodwill [Roll Forward]
Beginning Balance	223,134	224,473
Acquired goodwill	0	0
Impairment loss recognized	(40,237)	0
Transfer of goodwill between segments	(24,242)	(3,492)
Disposition	(7,074)
Foreign currency translation	4,505	2,153
Ending Balance	$ 156,086	$ 223,134

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