Fair Value Measurements - Summary of Gain (Loss) Derivative Instruments (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value adjustments, net	$ 37,239	$ 10,067	$ 33,440	$ 1,248
Embedded Derivative, Gain (Loss) on Embedded Derivative, Net	664	0	664	0
Equity Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Unrealized Gain (Loss) on Securities	36,575	(2,273)	32,007	(11,092)
Realized gain (loss) on equity securities	0	12,340	769	12,340
Exchange agreement embedded derivative
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Embedded Derivative, Gain (Loss) on Embedded Derivative, Net	$ 664	$ 0	$ 664	$ 0