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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, 2017
Mar. 31, 2016
Dec. 31, 2016
Dec. 31, 2009
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Compensation expense $ 0.1 $ 0.1    
Trustee fees 0.3 0.2    
Total unrecognized compensation cost related to nonvested awards $ 20.4      
Weighted-average period over which cost is expected to be recognized 2 years 4 months 24 days      
LTIP Units [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total fair value of shares that vested $ 8.2   $ 13.6  
Restricted Stock [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total fair value of shares that vested 0.4   0.7  
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 9.8      
Compensation expense 7.6   2.2  
Unit based compensation $ 2.0   $ 10.9  
Weighted average grant date fair value, grants (in dollars per share) $ 31.00   $ 34.50  
Officers and Employees [Member] | Second Amended 2016 Plan [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of shares authorized 1,794,293      
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 292,224      
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 7,605      
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 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 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 5,290      
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%
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 $ 1.9      
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 13,491      
Shares granted to trustees for trustee fees vesting on one year anniversary of grant date 4,674      
Shares granted to trustees for trustee fees begin vesting on two year anniversary of grant date 8,817      
Annual vesting rate of shares granted to trustees that begin vesting on the second anniversary of grant date 33.00%      
Fund III [Member] | Long Term Investment Alignment Program [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Compensation expense $ 0.3 $ 1.5    
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%
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       14.40%