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Capital Vesting Schedule for restricted shares (Details) | 3 Months Ended
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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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- 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 + Details
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