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Fair Value Disclosure (Schedule of Assets and Liabilities) (Details) - Fair value measurements, recurring - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets:
Equity securities	$ 15,702	$ 15,534
Total assets accounted for at fair value on a recurring basis	15,702	15,534
Significant Other Observable Inputs (Level 2)
Assets:
Equity securities	0	0
Total assets accounted for at fair value on a recurring basis	0	0
Significant Unobservable Inputs (Level 3)
Assets:
Equity securities	0	0
Total assets accounted for at fair value on a recurring basis	0	0
Estimate of Fair Value Measurement
Assets:
Equity securities	15,702	15,534
Total assets accounted for at fair value on a recurring basis	$ 15,702	$ 15,534

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Amount of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI), classified as current.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 210
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