Quarterly report pursuant to Section 13 or 15(d)

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

v3.21.1
Disclosure Of Fair Value Of Assets And Liabilities (Schedule Of Valuation Techniques And Significant Unobservable Assumptions) (Details) - Level 3 [Member]
Mar. 31, 2021
Measurement Assumptions, Discount Rates [Member]  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
Office properties held for sale 10
Measurement Assumptions, Exit Capitalization Rates [Member]  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
Office properties held for sale 8.50
Measurement Assumptions, Market Rental Rates Per Square Foot [Member]  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
Office properties held for sale 34.50
Measurement Assumptions, Market Rates Per Square Foot [Member]  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
Land properties held for sale 12.00