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3. Fair Value Measurements Fair Value and Gross Unrealized Losses with Unrealized Losses (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair Value, Option, Changes in Fair Value, Gain (Loss) $ (5,193,554) $ 4,926,248 $ 4,495,825
Asset at Fair Value, Changes in Fair Value Resulting from Changes in Assumptions 25,600    
Interest expense 38,114 1,551 21,861
Income from operations 482,616 500,336 421,326
Foreign exchange losses, net (205) 2,753 1,771
Other Nonoperating Income (Expense) (44,574) (26,775) (24,488)
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest (4,704,273) 5,449,055 4,918,007
Fair value of Appreciation rights      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Investment Owned, Unrecognized Unrealized Depreciation 75,000    
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) 5,193,600 (4,926,200) (4,495,800)
Segment Reconciling Items [Member] | Foreign Currency Gain (Loss) [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Foreign exchange losses, net 200 (2,700) (1,700)
Segment Reconciling Items [Member] | Interest Expense      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Interest expense (38,100) (1,500) (21,900)
Segment Reconciling Items [Member] | Other Nonoperating Income (Expense) [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Other Nonoperating Income (Expense) 44,600 26,800 24,500
Operating Segments [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Income from operations $ 482,600 $ 500,300 $ 421,300