Annual report pursuant to Section 13 and 15(d)

CERTAIN RELATIONSHIPS AND RELATED-PARTY TRANSACTIONS Certain Relationships and Related-Party Transactions (Details)

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CERTAIN RELATIONSHIPS AND RELATED-PARTY TRANSACTIONS Certain Relationships and Related-Party Transactions (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2019
USD ($)
director
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Related Party Transaction [Line Items]      
Related-party revenue $ 131,909 $ 157,834 $ 125,802
Related-party expenses 1,711 4,300 4,430
Related-party acquisition related $ 3,000 0 0
Liberty Media [Member]      
Related Party Transaction [Line Items]      
Number of directors nominated by related party | director 2    
Equity Method Investee [Member]      
Related Party Transaction [Line Items]      
Related-party revenue $ 2,700 2,700 2,900
Related-party expenses 1,000 1,100 $ 1,400
Due from Related Parties $ 21,100 $ 10,400