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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
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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

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- Definition Amount of increase (decrease) in fair value from changes in the assumptions or model used to calculate the fair value of a contract to service financial assets under which the benefits of servicing are expected to more than adequately compensate the servicer. + References No definition available. + Details
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