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11. Segment Information Segment Profit Reconciliations (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |
Income before income taxes | $ 1,245,945 | $ 769,601 | $ 2,144,644 | $ 1,896,867
Marketable Securities, Unrealized Gain (Loss) | 1,183,488 | 716,389 | 2,011,159 | 1,775,619
Operating Segments [Member] |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |
Income before income taxes | 49,200 | 53,300 | 121,500 | 106,900
Corporate, Non-Segment [Member] |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |
Income before income taxes | (3,200) | (2,800) | (6,900) | (5,700)
Segment Reconciling Items [Member] |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |
Marketable Securities, Unrealized Gain (Loss) | 1,183,500 | 716,400 | 2,011,200 | 1,775,600
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 | (800) | (1,200) | (1,700) | (2,500)
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 | $ 17,200 | $ 3,900 | $ 20,500 | $ 22,600

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