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Goodwill and Intangible Assets - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Feb. 28, 2019
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Business Acquisition [Line Items]        
Goodwill   $ 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   9,800 $ 9,600  
Cumulative waived management fees       147,000
Amortization of intangible assets   $ 4,900 $ 5,700  
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