Fair Value Disclosure (On a Recurring Basis) (Details) - Fair value measurements, recurring - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Level 1
Assets:
Equity securities	$ 14,655	$ 13,164
Assets at fair value	14,655	13,164
Level 2
Assets:
Equity securities	0	0
Assets at fair value	0	0
Level 3
Assets:
Equity securities	0	0
Assets at fair value	0	0
Total
Assets:
Equity securities	14,655	13,164
Assets at fair value	$ 14,655	$ 13,164