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Share Incentive and Other Compensation - Narrative (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Dec. 31, 2017 | Dec. 31, 2009
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Compensation expense | $ 0.1 | $ 0.1 |  |
Trustee fees | 0.3 | 0.3 |  |
Total unrecognized compensation cost related to nonvested awards | $ 21.0 |  |  |
Weighted-average period over which cost is expected to be recognized | 1 year 11 months |  |  |
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 | $ 8.8 |  | $ 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 Stock |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Total fair value of shares that vested | $ 0.7 |  | 0.7 |
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 |  |  | $ 8.4 |
Weighted average grant date fair value, grants (in dollars per share) | $ 27.26 |  | $ 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 |  |  |
Officer | 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 |  |  |
Officer | Restricted Stock |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Shares issued during period, share-based compensation, net of forfeitures | 5,768 |  |  |
Trustee | LTIP Units |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Shares issued during period, share-based compensation, net of forfeitures | 11,105 |  |  |
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 | 5,805 |  |  |
Trustee | LTIP Units | Tranche 2 |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Shares issued during period, share-based compensation, net of forfeitures | 5,300 |  |  |
General and Administrative Expense | LTIP Units and Restricted Stock |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Unit based compensation | $ 2.2 | 1.9 |  |
Trustee | Restricted Stock |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Shares issued during period, share-based compensation, net of forfeitures | 11,814 |  |  |
Shares granted to trustees for trustee fees vesting on one year anniversary of grant date | 3,864 |  |  |
Shares granted to trustees for trustee fees begin vesting on two year anniversary of grant date | 7,950 |  |  |
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% |  |  |
Second Amended 2016 Plan | Officers and Employees |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Number of shares authorized | 1,223,815 |  |  |
Long Term Investment Alignment Program | Senior Executives |  |  |  |
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 | $ 0.3 |  |
Long Term Investment Alignment Program | Fund III | Senior Executives |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Percentage of promote awarded as share based compensation award |  |  |  | 25.00%
Long Term Investment Alignment Program | Fund IV | Senior Executives |  |  |  |
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 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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