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Goodwill and Intangible Assets - Textual (Details) $ in Thousands	3 Months Ended		12 Months Ended
	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($) reportable_segment	Dec. 31, 2018 USD ($) reportable_segment
Goodwill [Line Items]
Impairment and other losses	$ 77,240	$ 6,655	$ 96,399	$ 8,599	$ 87,204
Goodwill, Impairment Loss			61,661	4,879
Goodwill	668,211	731,691	668,211	731,691	732,752
Goodwill, impaired, accumulated impairment loss	238,965	177,304	$ 238,965	177,304
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life			8 years
Amortization Of Intangible Assets, Finite Lived			$ 11,260	11,828	17,290
Indefinite-Lived Trademarks	0	14,600	$ 0	14,600
Customer Relationships
Goodwill [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life			8 years
Trademarks
Goodwill [Line Items]
Impairment of Intangible Assets (Excluding Goodwill)	$ 12,071
Finite-Lived Intangible Asset, Useful Life	5 years
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life			9 years
Indefinite-Lived Trademarks	$ 14,600		$ 14,600
Integrated Networks - Group A
Goodwill [Line Items]
Goodwill, Impairment Loss			0	4,879
Goodwill	134,573	134,573	134,573	134,573	139,452
Integrated Networks - Group A | Reporting Unit, 1 [Member]
Goodwill [Line Items]
Goodwill	14,854		14,854
Integrated Networks - Group B
Goodwill [Line Items]
Goodwill, Impairment Loss			16,137	0
Goodwill	272,158	268,387	272,158	$ 268,387	$ 267,059
Media & Data Network
Goodwill [Line Items]
Number of Reporting Units | reportable_segment				1	1
Goodwill, Impairment Loss			5,287	$ 0
Goodwill	105,394	$ 105,597	105,394	$ 105,597	$ 101,768
All Other | Reporting Unit, 2 [Member]
Goodwill [Line Items]
Goodwill	$ 5,479		$ 5,479

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