Shareholders' Equity - Dividend Reinvestment Program (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Dividend Reinvestment Program
Issuance of common shares (in shares)	19	23	65	64
Weighted average price per share (in dollars per share)	$ 23.73	$ 22.51	$ 22.97	$ 25.12
Net proceeds	$ 459	$ 516	$ 1,468	$ 1,581

Amount of cash inflow from capital contributions to an entity associated with a dividend reinvestment plan.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 14
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3255-108585

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- Definition

Number of shares issued during the period from a dividend reinvestment plan (DRIP). A dividend reinvestment plan allows the shareholders to reinvest dividends paid to them by the entity on new issues of stock by the entity.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=123467817&loc=d3e21463-112644

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- Definition

Dividend Reinvestment Program

+ References

No definition available.

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- Definition

Stock Issued During Period, Weighted Average Price Per Share, Dividend Reinvestment Plan

+ References

No definition available.

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