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Share-Based Compensation - Narrative (Details) - USD ($) |  |  |  | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | ---
Jul. 19, 2018 | Jun. 02, 2018 | Jun. 02, 2015 | Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Distributions to non-controlling interest holders |  |  |  |  |  | $ 448,000 |  |
Distributions paid |  |  |  |  |  | $ 448,000 | $ 574,000 |
Director |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Shares issued in lieu of cash (shares) |  |  |  |  |  | 0 | 0 |
Restricted Share Plan |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Annual retainer payable, cash |  |  |  | 50.00% |  | 50.00% |  |
Annual retainer payable, restricted stock units |  |  |  | 50.00% |  | 50.00% |  |
Restricted Share Plan | Independent Directors |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Annual retainer payable |  |  |  | $ 100,000 |  | $ 100,000 |  |
Restricted Share Plan | Non-Executive Chair |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Annual retainer payable |  |  |  | 105,000 |  | 105,000 |  |
Restricted Share Plan | Directors, Servicing on Committees |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Annual retainer payable |  |  |  | 30,000 |  | 30,000 |  |
2015 OPP |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Shares issued during the period (shares) |  |  | 3,013,933.0666666667 |  |  |  |  |
Compensation (income) expense |  |  |  | $ 1,900,000 | $ (1,000,000) | $ (800,000) | $ (3,200,000) |
Requisite service period |  |  |  |  |  | 2 years 9 months 35 days |  |
Award value, percent of market capitalization |  |  | 5.00% |  |  |  |  |
Distribution percent entitled to by LTIP holders |  |  |  | 10.00% |  | 10.00% |  |
2015 OPP | Target |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Restricted share vesting period |  |  | 3 years |  |  |  |  |
Award performance period |  |  | 3 years |  |  |  |  |
2015 OPP | Below Threshold |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Restricted share vesting period |  |  | 1 year |  |  |  |  |
2015 OPP | Threshold |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Restricted share vesting period |  |  | 2 years |  |  |  |  |
2018 Multi Year Outperformance Plan |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Maximum award value | $ 50,000,000 |  |  |  |  |  |  |
Share price (usd per share) | $ 19.57 |  |  |  |  |  |  |
2018 Multi Year Outperformance Plan | Target |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Absolute TSR | 30.00% |  |  |  |  |  |  |
Relative TSR excess | 0 |  |  |  |  |  |  |
2018 Multi Year Outperformance Plan | Below Threshold |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Absolute TSR | 24.00% |  |  |  |  |  |  |
Relative TSR excess | (0.06) |  |  |  |  |  |  |
2018 Multi Year Outperformance Plan | Threshold |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Absolute TSR | 24.00% |  |  |  |  |  |  |
Relative TSR excess | (0.06) |  |  |  |  |  |  |
2018 Multi Year Outperformance Plan | Minimum | Tier One |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Absolute TSR | 24.00% |  |  |  |  |  |  |
Relative TSR excess | (0.06) |  |  |  |  |  |  |
2018 Multi Year Outperformance Plan | Minimum | Tier Two |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Absolute TSR | 36.00% |  |  |  |  |  |  |
Relative TSR excess | 0.00 |  |  |  |  |  |  |
2018 Multi Year Outperformance Plan | Maximum | Tier One |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Absolute TSR | 30.00% |  |  |  |  |  |  |
Relative TSR excess | 0.00 |  |  |  |  |  |  |
2018 Multi Year Outperformance Plan | Maximum | Tier Two |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Absolute TSR | 30.00% |  |  |  |  |  |  |
Relative TSR excess | 0.06 |  |  |  |  |  |  |
Stock Options | Stock Option Plan |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Number of shares authorized (shares) |  |  |  | 500,000.0 |  | 500,000.0 |  |
Shares issued during the period (shares) |  |  |  |  |  | 0 |  | 0
Restricted Stock Units (RSUs) | Restricted Share Plan |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Restricted share vesting period |  |  |  |  |  | 3 years |  |
Percentage of maximum Common Stock available for issuance |  |  |  |  |  | 10.00% |  |
Restricted Stock | Restricted Share Plan |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Compensation (income) expense |  |  |  | $ 100,000 | $ 100,000 | $ 400,000 | 500,000 |
Restricted Stock | Restricted Share Plan |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Compensation expense |  |  |  | 800,000 |  | $ 800,000 |  |
Weighted average period of recognition |  |  |  |  |  | 2 years |  |
LTIP Units |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Distributions paid |  |  |  | 200,000 |  | $ 400,000 | $ 500,000 |
LTIP Units | Target |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Award vesting percent |  |  |  |  |  | 33.33% |  |
LTIP Units | Below Threshold |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Award vesting percent |  |  |  |  |  | 33.33% |  |
LTIP Units | Threshold |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Award vesting percent |  |  |  |  |  | 33.33% |  |
LTIP Units | Advisor |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Distributions to non-controlling interest holders |  |  |  | $ 100,000 |  |  |  |
LTIP Units | 2018 Multi Year Outperformance Plan |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Shares issued during the period (shares) |  | 2,554,930 |  |  |  |  |  |
LTIP Units | 2018 Multi Year Outperformance Plan | Advisor |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Shares issued during the period (shares) | 2,554,930 |  |  |  |  |  |  |

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5047-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -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=115993241&loc=d3e301413-122809 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -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=109197908&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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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