Fair Value Disclosure (Fair Value, Assets and Liabilities) (Details) - USD ($) $ in Thousands	Jun. 30, 2026	Dec. 31, 2025
Assets:
Equity securities	$ 19,121	$ 17,696
Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets:
Total assets accounted for at fair value on a recurring basis	27,440	32,275
Quoted Prices in Active Markets for Identical Assets (Level 1) \| Equity securities
Assets:
Equity securities	19,121	17,696
Quoted Prices in Active Markets for Identical Assets (Level 1) \| Money market funds
Assets:
Money market funds	8,319	14,579
Significant Other Observable Inputs (Level 2)
Assets:
Total assets accounted for at fair value on a recurring basis	0	0
Significant Other Observable Inputs (Level 2) \| Equity securities
Assets:
Equity securities	0	0
Significant Other Observable Inputs (Level 2) \| Money market funds
Assets:
Money market funds	0	0
Significant Unobservable Inputs (Level 3)
Assets:
Total assets accounted for at fair value on a recurring basis	0	0
Significant Unobservable Inputs (Level 3) \| Equity securities
Assets:
Equity securities	0	0
Significant Unobservable Inputs (Level 3) \| Money market funds
Assets:
Money market funds	0	0
Estimate of Fair Value Measurement
Assets:
Total assets accounted for at fair value on a recurring basis	27,440	32,275
Estimate of Fair Value Measurement \| Equity securities
Assets:
Equity securities	19,121	17,696
Estimate of Fair Value Measurement \| Money market funds
Assets:
Money market funds	$ 8,319	$ 14,579