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Share Incentive and Other Compensation - Narrative (Details) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2016 executive shares | Dec. 31, 2016 USD ($) $ / shares shares | Dec. 31, 2015 USD ($) $ / shares | Dec. 31, 2014 USD ($) $ / shares | Dec. 31, 2009
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Number of executives retired during period | executive | 2 |  |  |  |
Trustee fees |  | $ 1,100 | $ 900 |  |
Total unrecognized compensation cost related to nonvested awards |  | $ 15,500 |  |  |
Weighted-average period over which cost is expected to be recognized |  | 1 year 10 months 24 days |  |  |
Intrinsic value of options (less than) |  | $ 100 | 608 | $ 828 |
LTIP Units [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Shares issued during period, share-based compensation, net of forfeitures | shares | 29,418 |  |  |  |
Compensation expense |  | 1,100 |  |  |
Total fair value of shares that vested |  | 13,600 | 6,700 | 5,300 |
Acceleration of LTIP Units [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Compensation expense |  | 1,800 |  |  |
Restricted Stock [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Total fair value of shares that vested |  | 700 | 600 | $ 800 |
LTIP Units and Restricted Stock [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Total value of restricted shares and LTIP units as of the grant date |  | 10,100 |  |  |
Compensation expense |  | 8,200 | 1,900 |  |
Unit based compensation |  | $ 10,900 | $ 6,800 |  |
Weighted average grant date fair value, grants (in dollars per share) | $ / shares |  | $ 34.50 | $ 33.90 | $ 26.30 |
Senior Executives [Member] | Long Term Investment Alignment Program [Member] |  |  |  |  |
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%
Officers and Employees [Member] | Second Amended 2016 Plan [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Increase in number of shares authorized | shares |  | 1,600,000 |  |  |
Number of shares authorized | shares |  | 3,700,000 |  |  |
Officer [Member] | LTIP Units [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Shares issued during period, share-based compensation, net of forfeitures | shares |  | 319,244 |  |  |
Officer [Member] | Restricted Stock [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Shares issued during period, share-based compensation, net of forfeitures | shares |  | 11,092 |  |  |
Trustee [Member] | LTIP Units [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Shares issued during period, share-based compensation, net of forfeitures | shares |  | 10,822 |  |  |
Trustee [Member] | LTIP Units [Member] | Share-based Compensation, Tranche One [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Shares issued during period, share-based compensation, net of forfeitures | shares |  | 5,532 |  |  |
Trustee [Member] | LTIP Units [Member] | Share-based Compensation Award, Tranche Two [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Shares issued during period, share-based compensation, net of forfeitures | shares |  | 5,290 |  |  |
General and Administrative Expense [Member] | LTIP Units and Restricted Stock [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Unit based compensation |  | $ 10,900 | $ 6,800 | $ 6,200 |
Trustee [Member] | Restricted Stock [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Shares issued during period, share-based compensation, net of forfeitures | shares |  | 13,491 |  |  |
Shares granted to trustees for trustee fees vesting on one year anniversary of grant date | shares |  | 4,674 |  |  |
Shares granted to trustees for trustee fees begin vesting on two year anniversary of grant date | shares |  | 8,817 |  |  |
Annual vesting rate of shares granted to trustees that begin vesting on the second anniversary of grant date |  | 33.00% |  |  |
Fund IV [Member] | Senior Executives [Member] | Long Term Investment Alignment Program [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Percentage of promote awarded as share based compensation award |  |  |  |  | 9.30%
Fund III [Member] | Long Term Investment Alignment Program [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Compensation expense |  | $ 5,000 |  |  |
Fund III [Member] | Senior Executives [Member] | Long Term Investment Alignment Program [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Percentage of promote awarded as share based compensation award |  |  |  |  | 25.00%

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