Fair Value - Schedule of Recurring Financial Assets and Liabilities (Details) - USD ($) $ in Thousands		Mar. 31, 2022	Dec. 31, 2021
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment in debt securities at fair value - carrying value	[1]	$ 327,793	$ 355,178
Fair value, recurring | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment in debt securities at fair value - carrying value		0	0
Put option liability		0	0
Fair value, recurring | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment in debt securities at fair value - carrying value		327,793	355,178
Put option liability		0	0
Fair value, recurring | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment in debt securities at fair value - carrying value		0	0
Put option liability		26,867	23,667
Fair value, recurring | Carrying value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment in debt securities at fair value - carrying value		327,793	355,178
Put option liability		$ 26,867	$ 23,667

[1] As of March 31, 2022, Investments in securities at fair value include an amortized cost basis of $336.6 million and a net unrealized loss of $8.8 million. As of December 31, 2021, Investments in securities at fair value include an amortized costs basis of $354.2 million and net unrealized gains $1.0 million.