Annual report pursuant to Section 13 and 15(d)

Disclosure Of Fair Value Of Assets And Liabilities (Schedule Of Valuation Techniques And Significant Unobservable Inputs) (Details)

v3.3.1.900
Disclosure Of Fair Value Of Assets And Liabilities (Schedule Of Valuation Techniques And Significant Unobservable Inputs) (Details) - Level 3 [Member] - Discounted Cash Flow [Member]
12 Months Ended
Dec. 31, 2015
USD ($)
Discount Rate [Member] | Suburban [Member]  
Fair Value Inputs, Assets, Quantitative Information [Line Items]  
Fair value $ 404,863,000
Discount Rate [Member] | Suburban [Member] | Minimum [Member]  
Fair Value Inputs, Assets, Quantitative Information [Line Items]  
Discount rate 8.00%
Discount Rate [Member] | Suburban [Member] | Maximum [Member]  
Fair Value Inputs, Assets, Quantitative Information [Line Items]  
Discount rate 15.00%
Discount Rate [Member] | Central Business District [Member] | Minimum [Member]  
Fair Value Inputs, Assets, Quantitative Information [Line Items]  
Discount rate 6.00%
Discount Rate [Member] | Central Business District [Member] | Maximum [Member]  
Fair Value Inputs, Assets, Quantitative Information [Line Items]  
Discount rate 9.50%
Exit Capitalization Rate [Member] | Suburban [Member] | Minimum [Member]  
Fair Value Inputs, Assets, Quantitative Information [Line Items]  
Discount rate 7.50%
Exit Capitalization Rate [Member] | Suburban [Member] | Maximum [Member]  
Fair Value Inputs, Assets, Quantitative Information [Line Items]  
Discount rate 9.00%
Exit Capitalization Rate [Member] | Central Business District [Member] | Minimum [Member]  
Fair Value Inputs, Assets, Quantitative Information [Line Items]  
Discount rate 5.00%
Exit Capitalization Rate [Member] | Central Business District [Member] | Maximum [Member]  
Fair Value Inputs, Assets, Quantitative Information [Line Items]  
Discount rate 5.75%