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Segment Information Segment Profit Reconciliation (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]      
Income from operations $ 337,796 $ 482,616 $ 500,336
Interest expense 49,439 38,114 1,551
Foreign currency exchange (gains) losses, net (7,347) (205) 2,753
Debt and Equity Securities, Unrealized Gain (Loss) 1,252,251 5,193,554 (4,926,248)
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
Operating Segments [Member]      
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]      
Income from operations 337,800 482,600 500,300
Segment Reconciling Items [Member]      
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]      
Foreign currency exchange (gains) losses, net 7,300 200 (2,700)
Debt and Equity Securities, Unrealized Gain (Loss) (1,252,300) (5,193,600) 4,926,200
Other Nonoperating Income (Expense) 106,400 44,600 26,800
Segment Reconciling Items [Member] | Interest Expense      
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]      
Interest expense $ (49,300) $ (38,100) $ (1,500)