Shareholders' Equity (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions	1 Months Ended
Dec. 31, 2019	Dec. 09, 2019
Class of Stock [Line Items]
Common stock shares purchased		284,608
Price per share		$ 35.1361
Purchase price		$ 10.1
Knowledge Capital [Member]
Class of Stock [Line Items]
Number of common stock shares held	2,800,000
Minimum [Member] \| Knowledge Capital [Member]
Class of Stock [Line Items]
Investment period	20 years

Amount recognized for assets, including goodwill, in excess of (less than) the aggregate liabilities assumed.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=116869197&loc=d3e4845-128472

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