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Capital Vesting Schedule for restricted shares (Details) - shares | 3 Months Ended
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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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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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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=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 + Details
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