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Condensed Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Thousands
Mar. 31, 2023
Dec. 31, 2022
Available-for-sale securities, amortized cost $ 259,928 $ 293,476
Common stock, par value (USD per share) $ 0.001 $ 0.001
Common stock authorized (shares) 200,000,000 200,000,000
Common stock issued (shares) 32,060,922 31,780,075
Common stock outstanding (shares) 32,060,922 31,780,075
Variable interest asset entities [1] $ 2,515,791 $ 2,678,243
Variable interest liability entities [1] 2,158,186 $ 2,311,114
Variable Interest Entity Primary Beneficiary    
Variable interest asset entities 187,693  
Variable Interest Entity Primary Beneficiary | Nonrecourse    
Variable interest liability entities $ 203,730  
[1] As of March 31, 2023, includes $187,693 of assets related to consolidated variable interest entities that can be used only to settle obligations of the consolidated variable interest entities and $203,730 of liabilities of consolidated variable interest entities for which creditors do not have recourse to the general credit of the Company. See Note 7.