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Investment Partnerships - Fair Value and Adjustments (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Increase (Decrease) In Equity Method Investments [Roll Forward]      
Investment partnership gains (losses) $ 19,440 $ (75,953) $ 10,953
Fair Value      
Increase (Decrease) In Equity Method Investments [Roll Forward]      
Fair value of partnership interest, beginning balance 383,004 474,201 590,926
Investment partnership gains (losses) 59,238 (80,374) 51,145
Distributions (net of contributions)   (10,823) (167,870)
Contributions (net of distributions) 30,530    
Increase in proportionate share of Company stock held
Fair value of partnership interest, ending balance 472,772 383,004 474,201
Company Common Stock      
Increase (Decrease) In Equity Method Investments [Roll Forward]      
Fair value of partnership interest, beginning balance 227,210 223,802 171,376
Investment partnership gains (losses) 39,797 (4,421) 40,192
Distributions (net of contributions)  
Contributions (net of distributions)    
Increase in proportionate share of Company stock held 6,662 7,829 12,234
Fair value of partnership interest, ending balance 273,669 227,210 223,802
Carrying Value      
Increase (Decrease) In Equity Method Investments [Roll Forward]      
Fair value of partnership interest, beginning balance 155,794 250,399 419,550
Investment partnership gains (losses) 19,441 (75,953) 10,953
Distributions (net of contributions)   (10,823) (167,870)
Contributions (net of distributions) 30,530    
Increase in proportionate share of Company stock held (6,662) (7,829) (12,234)
Fair value of partnership interest, ending balance $ 199,103 $ 155,794 $ 250,399