Fair Value Disclosure (On a Recurring Basis) (Details) - Fair value measurements, recurring - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Level 1
Assets:
Equity securities	$ 16,643	$ 16,070
Assets at fair value	16,643	16,070
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	16,643	16,070
Assets at fair value	$ 16,643	$ 16,070

Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258

Name:	us-gaap_AssetsFairValueDisclosure
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant