Annual report pursuant to Section 13 and 15(d)

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

v3.20.4
CERTAIN RELATIONSHIPS AND RELATED-PARTY TRANSACTIONS Certain Relationships and Related-Party Transactions (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2020
USD ($)
director
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Related Party Transaction [Line Items]      
Related-party revenue $ 482 $ 131,909 $ 157,834
Related-party expenses 1,009 1,711 4,300
Related-party acquisition related $ 0 3,000 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 $ 500 2,700 2,700
Related-party expenses 1,300 1,000 $ 1,100
Due from Related Parties $ 12,600 $ 21,100