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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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