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10. Segment Information Segment Profit Reconciliations (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |
Income before income taxes | $ 1,156,775 | $ 1,245,945 | $ 2,453,978 | $ 2,144,644
Marketable Securities, Unrealized Gain (Loss) | 1,030,691 | 1,183,488 | 2,210,094 | 2,011,159
Operating Segments [Member] |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |
Income before income taxes | 124,400 | 46,000 | 224,900 | 114,600
Segment Reconciling Items [Member] |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |
Marketable Securities, Unrealized Gain (Loss) | 1,030,700 | 1,183,500 | 2,210,100 | 2,011,200
Foreign Currency Gain (Loss) [Member] | Segment Reconciling Items [Member] |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |
Income before income taxes | 1,800 | (800) | 1,700 | (1,700)
Other Nonoperating Income (Expense) [Member] | Segment Reconciling Items [Member] |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |
Income before income taxes | $ (100) | $ 17,200 | $ 17,300 | $ 20,500

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