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Short-term Investments: Investment in Viking - Narrative (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Variable Interest Entity [Line Items] |  |  |
Investment in Viking common stock | $ 63.1 | $ 30.9 |
Warrants | $ 0.0 | $ 0.0 | $ 1.5
Exercise price of warrants (USD per share) |  |  | $ 1.50
Viking Therapeutics, Inc. |  |  |
Variable Interest Entity [Line Items] |  |  |
Ownership interest (as a percent) | 8.60% |  |
Stock sold of equity method investee (in shares) |  | 0.6 |

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