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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

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