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Investments (Narrative) (Details)
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2023
USD ($)
shares
Jun. 30, 2022
USD ($)
investment
shares
Jun. 30, 2023
USD ($)
shares
Jun. 30, 2022
USD ($)
investment
shares
Dec. 31, 2022
USD ($)
investment
May 19, 2023
Apr. 12, 2022
USD ($)
Debt Securities, Available-for-sale [Line Items]              
Shares held | shares 1,000,000   1,000,000        
Investment in corporate debt securities $ 32,100,000   $ 32,100,000   $ 58,400,000    
Shares issued in debt-for-equity exchange (in shares) | shares   2,300,000   2,300,000      
Aggregate purchase price   $ 90,000,000.0   $ 90,000,000.0      
Number of shares sold in transaction (in shares) | shares 0   52,393        
Gross unrealized gains $ 100,000   $ 100,000   $ 600,000    
Investments in an unrealized loss position | investment   0   0 0    
Impairment losses     0   $ 0    
Loss from equity method investment, net (573,000) $ (6,101,000) (9,755,000) $ (6,886,000)      
Management fees recognized 0 $ 800,000 0 $ 1,500,000      
Equity method investments 99,300,000   99,300,000   112,300,000    
OCV Management, LLC              
Debt Securities, Available-for-sale [Line Items]              
Maximum exposure of investment 99,300,000   99,300,000   112,300,000    
Corporate Debt Securities              
Debt Securities, Available-for-sale [Line Items]              
Debt securities, available-for-sale, coupon rate           6.00% 4.00%
Debt securities, available-for-sale             $ 15,000,000
Carrying value of investment 15,100,000   15,100,000   15,600,000    
Maximum exposure of investment $ 15,100,000   $ 15,100,000   $ 15,600,000