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Shareholders' Equity / Partners' Capital - 2012 Equity Incentive Plan (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2012
Class of Stock [Line Items] |  |  |  |
Noncash share-based compensation | $ 4,212 | $ 3,636 | $ 3,125 |
Restatement Adjustment | Reclassification of Noncash Share-based Compensation to General and Administrative Expenses |  |  |  |
Class of Stock [Line Items] |  |  |  |
Share-based compensation expense | 2,600 | 2,100 | 1,900 |
Restatement Adjustment | Reclassification of Noncash Share-based Compensation to Property Management Expenses |  |  |  |
Class of Stock [Line Items] |  |  |  |
Share-based compensation expense | 1,600 | 1,500 | 1,200 |
Stock options and Restricted stock units |  |  |  |
Class of Stock [Line Items] |  |  |  |
Noncash share-based compensation | 4,200 | $ 3,600 | $ 3,100 |
Stock options |  |  |  |
Class of Stock [Line Items] |  |  |  |
Total unrecognized compensation cost | $ 2,900 |  |  |
Weighted-average period of unvested cost | 2 years 2 months 19 days |  |  |
Restricted stock units |  |  |  |
Class of Stock [Line Items] |  |  |  |
Total unrecognized compensation cost | $ 3,700 |  |  |
Weighted-average period of unvested cost | 2 years 10 months 28 days |  |  |
2012 Equity Incentive Plan | Board of Trustees |  |  |  |
Class of Stock [Line Items] |  |  |  |
Vesting period | 4 years | 4 years | 4 years |
Expiration period | 10 years | 10 years | 10 years |
2012 Equity Incentive Plan | Restricted stock units |  |  |  |
Class of Stock [Line Items] |  |  |  |
Stock options granted (in shares) | 174,400 | 74,100 | 44,000 |
2012 Equity Incentive Plan | Class A common shares/units |  |  |  |
Class of Stock [Line Items] |  |  |  |
Shares available for issuance (in shares) |  |  |  | 6,000,000
2012 Equity Incentive Plan | Class A common shares/units | Stock options |  |  |  |
Class of Stock [Line Items] |  |  |  |
Stock options granted (in shares) | 385,200 | 708,000 | 588,500 |

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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5047-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Unrecognized cost of unvested share-based compensation awards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 + Details
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- Definition Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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