Income Taxes: (Schedule of Reasons Attributable to the Differences Between Effective Income Tax Rate And Federal Statutory Rate) (Details)	12 Months Ended
Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Income Tax Disclosure [Abstract]
U.S. federal statutory rate	21.00%	21.00%	21.00%
Increase (decrease) resulting from:
Foreign rate differences	(0.50%)	(0.30%)	0.60%
Dividend repatriation cost	0.70%	0.60%	0.40%
Global intangible low-taxed income	1.00%	0.80%	0.10%
U.S. state taxes	0.10%	0.20%	0.20%
Foreign derived intangible income	(0.80%)	(0.70%)	(0.60%)
Foreign exchange	(1.70%)	0.00%	0.00%
Other	(0.50%)	0.20%	0.00%
Effective tax rate	19.30%	21.80%	21.70%

Effective Income Tax Rate Reconciliation, Foreign Exchange, Percent

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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-Publisher FASB
-Name Accounting Standards Codification
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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Percentage of reported income tax benefit from difference to income tax expense (benefit) computed by applying domestic federal statutory income tax rate to pretax income (loss) from continuing operations, attributable to foreign-derived intangible income (FDII).

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations applicable to statutory income tax expense (benefit) outside of the country of domicile.

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Percentage of reported income tax expense from difference to expected income tax expense (benefit) computed by applying domestic federal statutory income tax rate to pretax income (loss) from continuing operations, attributable to global intangible low-taxed income (GILTI).

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to the repatriation of foreign earnings.

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations applicable to state and local income tax expense (benefit), net of federal tax expense (benefit).

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