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Shareholders' Equity (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions | 1 Months Ended |
--- | --- | ---
Dec. 31, 2019 | Dec. 09, 2019
Class of Stock [Line Items] |  |
Common stock shares purchased |  | 284,608
Price per share |  | $ 35.1361
Purchase price |  | $ 10.1
Knowledge Capital [Member] |  |
Class of Stock [Line Items] |  |
Number of common stock shares held | 2,800,000 |
Minimum [Member] | Knowledge Capital [Member] |  |
Class of Stock [Line Items] |  |
Investment period | 20 years |

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