Investments - Summary of Income (Loss) on Equity Investments, Net (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Investments Debt And Equity Securities [Abstract]
Income on equity investments, net, before amortization of basis difference	$ 52,801	$ 7,242	$ 152,170	$ 6,302
Amortization of basis difference	(36,940)	(4,025)	(110,819)	(4,241)
Income on equity investments, net	$ 15,861	$ 3,217	$ 41,351	$ 2,061