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Goodwill and Intangible Assets - Narrative (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended		12 Months Ended
	Feb. 28, 2019	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2016	Dec. 31, 2019
Business Acquisition [Line Items]
Goodwill		$ 149,070		$ 149,070			$ 149,070
Waived management fees under affiliate agreement amount expected to collect monthly						$ 4,200
Waived management fees, included in affiliate contract expanse accumulated amortization		9,900	$ 9,700	19,700	$ 19,300
Cumulative waived management fees							$ 156,900
Amortization of intangible assets		$ 4,400	$ 5,100	$ 9,300	$ 10,800
Maximum
Business Acquisition [Line Items]
Waived management fees, included in affiliate contract expanse accumulated amortization						$ 255,600
Big sandy acquisition
Business Acquisition [Line Items]
Aggregate purchase price	$ 10,000
Property, plant and equipment acquired	4,600
Goodwill	2,600
Customer relationships | Big sandy acquisition
Business Acquisition [Line Items]
Subscriber relationship acquired	$ 2,800

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The amount of property, plant, and equipment recognized as of the acquisition date.

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Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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