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Capital Vesting Schedule for restricted shares (Details)	3 Months Ended
	Mar. 31, 2018 shares
Vest September 11, 2018 [Member] | Independent Trustees [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted shares issued	9,976
Restricted share grant date	Sep. 12, 2017
Restricted share vesting date	Sep. 11, 2018	[1]
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	Dec. 12, 2018	[1]
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	Dec. 13, 2018	[1]
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	Dec. 12, 2019	[1]
[1] Date at which such restricted shares will vest and become non-forfeitable.

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+ References

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21463-112644

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-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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