Annual report pursuant to Section 13 and 15(d)

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

v3.10.0.1
CERTAIN RELATIONSHIPS AND RELATED-PARTY TRANSACTIONS Certain Relationships and Related-Party Transactions (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2018
USD ($)
director
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Related Party Transaction [Line Items]      
Related-party revenue $ 158,171 $ 126,251 $ 117,384
Related-party expenses 4,300 4,430 2,859
Related-party acquisition related 0 0 2,145
Related-party payable $ 14,600 23,100  
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 $ 2,400 2,400 1,700
Related-party expenses $ 1,100 $ 1,400 $ 2,900