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Convertible Notes (Narrative) (Details 3) - $ / shares shares in Millions | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Nov. 17, 2017 | Nov. 14, 2017
Debt instrument |  |  |  |  |
Class of warrant or right, exercise price of warrants or rights |  |  |  |  | $ 23.30
1.375% Convertible senior notes due 2023 | Convertible senior notes |  |  |  |  |
Debt instrument |  |  |  |  |
Initial conversion price of notes (in dollars per share) | $ 18.93 | $ 18.93 | $ 18.93 | $ 18.93 |
Potential incremental common shares attributable to dilutive effect of contingently issuable shares |  | 1.4 |  |  |
Potential cumulative common shares attributable to dilutive effect of conversion of convertible notes payable | 0.5 |  |  |  |

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