Fair Value Disclosure (Schedule of Assets and Liabilities) (Details) - Fair Value, Measurements, Recurring - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets:
Equity securities	$ 17,208	$ 15,534
Total assets accounted for at fair value on a recurring basis	17,208	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	17,208	15,534
Total assets accounted for at fair value on a recurring basis	$ 17,208	$ 15,534