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Capital Vesting Schedule for restricted shares (Details) - shares	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Vest September 14, 2016 [Member] | Independent Trustees [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Issuance of restricted shares, shares	9,228
Restricted share grant date	Sep. 15, 2015
Restricted share vesting date	Sep. 14, 2016
Vest September 10, 2015 [Member] | Independent Trustees [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Issuance of restricted shares, shares		6,912
Restricted share grant date		Sep. 11, 2014
Restricted share vesting date		Sep. 10, 2015
Vest December 15, 2016 [Member] | Partially dedicated employees [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Issuance of restricted shares, shares	3,157
Restricted share grant date	Dec. 15, 2015
Restricted share vesting date	Dec. 15, 2016
Vest December 31, 2016 [Member] | Partially dedicated employees [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Issuance of restricted shares, shares	324
Restricted share grant date	Dec. 15, 2015
Restricted share vesting date	Dec. 31, 2016
Vest December 15, 2017 [Member] | Partially dedicated employees [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Issuance of restricted shares, shares	2,359
Restricted share grant date	Dec. 15, 2015
Restricted share vesting date	Dec. 15, 2017
December 31, 2017 [Member] | Partially dedicated employees [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Issuance of restricted shares, shares	322
Restricted share grant date	Dec. 15, 2015
Restricted share vesting date	Dec. 31, 2017

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+ 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=6928386&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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