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Share Incentive and Other Compensation - Narrative (Details) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2009
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Compensation expense | $ 0.2 | $ 0.2 |
Trustee fees | 1.2 | 1.1 |
Total unrecognized compensation cost related to nonvested awards | $ 14.3 |  |
Weighted-average period over which cost is expected to be recognized | 2 years 2 months |  |
LTIP Units |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Total fair value of shares that vested | $ 7.3 | 13.6 |
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 | 9.5 |  |
Compensation expense | 7.3 | 2.2 |
Unit based compensation | $ 8.4 | $ 10.9 |
Weighted average grant date fair value, grants (in dollars per share) | $ 31.69 | $ 34.34 |
Officers and Employees | Second Amended 2016 Plan |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Number of shares authorized | 1,756,317 |  |
Officer | LTIP Units |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Shares issued during period, share-based compensation, net of forfeitures | 306,635 |  |
Officer | Restricted Stock |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Shares issued during period, share-based compensation, net of forfeitures | 7,628 |  |
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 |  |
Senior Executives | 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%
General and Administrative Expense | LTIP Units and Restricted Stock |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Unit based compensation | $ 8.4 | $ 10.9 |
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% |  |
Fund III | Long Term Investment Alignment Program |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Compensation expense | $ 0.6 | $ 5.0 |
Fund III | Senior Executives | Long Term Investment Alignment Program |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Percentage of promote awarded as share based compensation award |  |  | 25.00%
Fund IV | Senior Executives | Long Term Investment Alignment Program |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Percentage of promote awarded as share based compensation award |  |  | 14.40%

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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://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 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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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