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Other Assets - Schedule of Other Assets (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Jun. 30, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Dec. 31, 2018
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]            
Prepaid expenses, net of current portion $ 26,118   $ 191      
Equity method investments 16,734 $ 16,990 15,795 $ 15,562 $ 14,490 $ 13,449
Other investments 2,527   2,123      
Other 4,990   3,679      
Other assets $ 50,369   $ 21,788