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Shareholders' Equity / Partners' Capital - 2012 Equity Incentive Plan Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Stock options and Restricted stock units |  |  |  |
Class of Stock [Line Items] |  |  |  |
Allocated share-based compensation expense | $ 0.9 | $ 1.1 | $ 1.9 | $ 2.1
Stock options and Restricted stock units | General and Administrative Expense |  |  |  |
Class of Stock [Line Items] |  |  |  |
Allocated share-based compensation expense | 0.5 | 0.7 | 1.1 | 1.2
Stock options and Restricted stock units | Property Management Expense |  |  |  |
Class of Stock [Line Items] |  |  |  |
Allocated share-based compensation expense | $ 0.4 | $ 0.4 | $ 0.8 | $ 0.9
Restricted stock units |  |  |  |
Class of Stock [Line Items] |  |  |  |
Restricted stock unit grants in period (in shares) |  |  | 304,400 | 174,000
2012 Equity Incentive Plan | Stock options and Restricted stock units |  |  |  |
Class of Stock [Line Items] |  |  |  |
Vesting period for stock options and restricted stock units |  |  | 4 years |
2012 Equity Incentive Plan | Stock options |  |  |  |
Class of Stock [Line Items] |  |  |  |
Granted (in shares) |  |  | 140,000 | 385,200
Expiration period for stock options |  |  | 10 years |

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Net number of share options (or share units) granted during the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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