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Fair Value Disclosure (Schedule of Assets and Liabilities) (Details) - Fair Value, Measurements, Recurring - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Quoted prices in active markets for identical assets (level 1)
Assets:
Equity securities	$ 15,534	$ 16,070
Total assets accounted for at fair value on a recurring basis	15,534	16,070
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	15,534	16,070
Total assets accounted for at fair value on a recurring basis	$ 15,534	$ 16,070

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