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Share Incentive and Other Compensation - Narrative (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017 | Dec. 31, 2009
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Compensation expense |  |  | $ 0.2 | $ 0.2 |  |
Trustee fees |  |  | 0.6 | 0.6 |  |
Total unrecognized compensation cost related to nonvested awards | $ 19.6 |  | $ 19.6 |  |  |
Weighted-average period over which cost is expected to be recognized |  |  | 1 year 9 months |  |  |
LTIP Units and Restricted Stock |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Total value of restricted shares and LTIP units as of the grant date |  |  | $ 10.6 |  |  |
Unit based compensation |  |  | $ 4.3 |  | $ 8.4 |
Weighted average grant date fair value, grants (in dollars per share) |  |  | $ 26.88 |  | $ 31.69 |
LTIP Units and Restricted Stock | Performance Period Ending December 31, 2020 |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Award vesting period |  |  | 3 years |  |  |
LTIP Units and Restricted Stock | Performance Fails To Achieve, Earned Performance-Based Shares Vest At End Of Performance Period |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Award vesting percentage |  |  | 60.00% |  |  |
LTIP Units and Restricted Stock | Performance Fails To Achieve |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Award vesting percentage |  |  | 40.00% |  |  |
Award vesting period |  |  | 2 years |  |  |
LTIP Units |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Award vesting percentage |  |  | 33.30% |  |  |
Award vesting period |  |  | 3 years |  |  |
Total fair value of shares that vested |  |  | $ 9.1 |  | $ 7.3 |
LTIP Units | Performance Period Ending December 31, 2020 |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Award vesting percentage |  |  | 66.70% |  |  |
Award vesting period |  |  | 3 years |  |  |
Restricted shares |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Total fair value of shares that vested |  |  | $ 0.8 |  | $ 0.7 |
Trustee | LTIP Units |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Shares issued during period, share-based compensation, net of forfeitures |  |  | 17,427 |  |  |
Trustee | LTIP Units | Tranche 1 |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Shares issued during period, share-based compensation, net of forfeitures |  |  | 8,478 |  |  |
Trustee | Restricted shares | Tranche 1 |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Shares issued during period, share-based compensation, net of forfeitures |  |  | 11,869 |  |  |
General and Administrative Expense | LTIP Units and Restricted Stock |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Unit based compensation | $ 2.1 | $ 2.5 | $ 4.3 | 4.5 |  |
Trustee | LTIP Units and Restricted Stock |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Award vesting period |  |  | 3 years |  |  |
Annual vesting rate of shares granted to trustees that begin vesting on the second anniversary of grant date |  |  | 33.00% |  |  |
Trustee | LTIP Units |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Shares granted to trustees for trustee fees vesting on one year anniversary of grant date | 8,949 |  | 8,949 |  |  |
Trustee | Restricted shares |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Shares issued during period, share-based compensation, net of forfeitures |  |  | 17,050 |  |  |
Shares granted to trustees for trustee fees vesting on one year anniversary of grant date | 5,181 |  | 5,181 |  |  |
Second Amended 2016 Plan |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Number of shares authorized | 1,185,947 |  | 1,185,947 |  |  |
Second Amended 2016 Plan | LTIP Units |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Shares issued during period, share-based compensation, net of forfeitures |  |  | 381,821 |  |  |
Second Amended 2016 Plan | Restricted shares |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Shares issued during period, share-based compensation, net of forfeitures |  |  | 5,768 |  |  |
Long Term Investment Alignment Program |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Max percentage of future fund III promote that may be awarded to senior executives |  |  |  |  |  | 25.00%
Long Term Investment Alignment Program | Fund III |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Compensation expense |  |  | $ 0.0 | $ 0.4 |  |
Percentage of promote awarded as share based compensation award |  |  |  |  |  | 25.00%
Long Term Investment Alignment Program | Fund IV |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Percentage of promote awarded as share based compensation award |  |  |  |  |  | 22.80%
Minimum | LTIP Units and Restricted Stock | TSR percentile falls between the 25th percentile and the 50th percentile |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Award vesting percentage |  |  | 50.00% |  |  |
Minimum | LTIP Units and Restricted Stock | TSR percentile falls between the 50th percentile and 75th percentile |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Award vesting percentage |  |  | 100.00% |  |  |
Maximum | LTIP Units and Restricted Stock | TSR percentile falls between the 25th percentile and the 50th percentile |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Award vesting percentage |  |  | 100.00% |  |  |
Maximum | LTIP Units and Restricted Stock | TSR percentile falls between the 50th percentile and 75th percentile |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Award vesting percentage |  |  | 200.00% |  |  |

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- Definition Maximum Percentage of Promote To Be Awarded as Share Based Compensation Awards. Promote is defined as the amount above a certain performance measurement threshold. + References No definition available. + Details
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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 The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested). + 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)(3) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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