Fair Value Disclosure (Schedule of Assets and Liabilities) (Details) - Fair value measurements, recurring - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets:
Equity securities	$ 18,284	$ 17,208
Total assets accounted for at fair value on a recurring basis	18,284	17,208
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	18,284	17,208
Total assets accounted for at fair value on a recurring basis	$ 18,284	$ 17,208