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Shareholders' Equity (Common Stock Buyback) (Details) - Common Stock Buyback - USD ($) shares in Thousands, $ in Thousands | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Equity, Class of Treasury Stock [Line Items] |  |  |
Total Number of Shares Repurchased (in shares) | 5,237 | 5,914 | 6,747
Total Cost | $ 310,769 | $ 338,442 | $ 411,534

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