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Grants to Trustees (Details)	Dec. 12, 2019 trustee $ / shares shares
Individual Trustee Grant Agreements 1 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of independent trustees (in trustees) | trustee	6
Number of trustee emeritus (in trustees) | trustee	1
Individual Trustee Grant Agreements 1 [Member] | Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock granted to trustees, vested in period (in shares) | shares	3,000
Restricted stock granted to each trustee (in shares) | shares	19,562
Restricted stock granted to trustees, weighted-average grant date fair value (in dollars per share) | $ / shares	$ 13.54
Individual Trustee Grant Agreements 2 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of independent trustees (in trustees) | trustee	2
Individual Trustee Grant Agreements 2 [Member] | Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock granted to each trustee (in shares) | shares	3,398
Restricted stock granted to trustees, weighted-average grant date fair value (in dollars per share) | $ / shares	$ 13.54

X

- Definition

The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(iii)(1)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

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X

- Definition

The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(iii)(1)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

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X

- Definition

The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(iii)(2)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

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- Definition

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+ References

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- Definition

Number of Independent Trustees

+ References

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- Definition

Number of Trustee Emeritus

+ References

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