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Fair Value Measurements and Investments Fair Value and Gross Unrealized Losses with Unrealized Losses (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair Value, Option, Changes in Fair Value, Gain (Loss) $ (1,252,251) $ (5,193,554) $ 4,926,248
Asset at Fair Value, Changes in Fair Value Resulting from Changes in Assumptions (24,500)    
Interest expense 49,439 38,114 1,551
Income from operations 337,796 482,616 500,336
Foreign currency exchange (gains) losses, net (7,347) (205) 2,753
Other Nonoperating Income (Expense) (106,443) (44,574) (26,775)
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest (850,104) (4,704,273) 5,449,055
Fair value of Appreciation rights      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Investment Owned, Unrecognized Unrealized Depreciation 31,300    
Segment Reconciling Items [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair Value, Option, Changes in Fair Value, Gain (Loss) 1,252,300 5,193,600 (4,926,200)
Foreign currency exchange (gains) losses, net 7,300 200 (2,700)
Other Nonoperating Income (Expense) 106,400 44,600 26,800
Segment Reconciling Items [Member] | Interest Expense      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Interest expense (49,300) (38,100) (1,500)
Operating Segments [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Income from operations $ 337,800 $ 482,600 $ 500,300