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Summary of Significant Accounting Policies Narrative Tagging (Details)
3 Months Ended
Mar. 31, 2017
Property
shares
Restricted Unit Awards [Member] | Burlington [Member] | Maximum [Member]  
Summary Of Significant Accounting Policies [Line Items]  
Approved grant of restricted units and other awards to employees | shares 3,000,000
RUAs granted with vesting range 3 years
Restricted Unit Awards [Member] | Burlington [Member] | Minimum [Member]  
Summary Of Significant Accounting Policies [Line Items]  
RUAs granted with vesting range 3 months
Consolidated Properties [Member]  
Summary Of Significant Accounting Policies [Line Items]  
Number of Real Estate Properties | Property 6
Consolidated Properties [Member] | Beneficial Unit Certificate Holders [Member]  
Summary Of Significant Accounting Policies [Line Items]  
Noncontrolling Interest, Ownership Percentage by Parent 99.00%