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Capital Vesting Schedule for restricted shares (Details) - shares			3 Months Ended		9 Months Ended
		Sep. 12, 2018	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted shares issued			13,144	9,976	13,144	9,976
Independent Trustees [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted shares issued		13,144
Vest September 11, 2018 [Member] | Independent Trustees [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted shares issued					13,144
Restricted share grant date					Sep. 12, 2018
Restricted share vesting date	[1]				Sep. 11, 2019
Vest December 12, 2018 [Member] | Partially dedicated employees [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted shares issued					2,630
Restricted share grant date					Dec. 12, 2017
Restricted share vesting date	[1]				Dec. 12, 2018
Vest December 13, 2018 [Member] | Partially dedicated employees [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted shares issued					1,556
Restricted share grant date					Dec. 13, 2016
Restricted share vesting date	[1]				Dec. 13, 2018
Vest December 12, 2019 [Member] | Partially dedicated employees [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted shares issued					1,783
Restricted share grant date					Dec. 12, 2017
Restricted share vesting date	[1]				Dec. 12, 2019
[1] Date at which such restricted shares will vest and become non-forfeitable.

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Total number of shares issued during the period, including shares forfeited, as a result of Restricted Stock Awards.

+ 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=109259400&loc=d3e21463-112644

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

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