Quarterly report pursuant to Section 13 or 15(d)

Basis of Presentation (Details)

v3.19.1
Basis of Presentation (Details)
$ in Thousands
3 Months Ended
Mar. 31, 2019
USD ($)
product
Mar. 31, 2018
USD ($)
Liberty    
Related Party Transaction, Amounts of Transaction | $ $ 924 $ 950
Skyhook    
Number Of Primary Products | product 2  
Charter    
Investment control percentage 25.01%