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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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Exercise price per share or per unit of warrants or rights outstanding.

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The price per share of the conversion feature embedded in the debt instrument.

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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of contingently issuable shares. Contingently issuable shares are those shares that are issuable for little or no cash contingent on certain conditions being met.

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