Quarterly report pursuant to Section 13 or 15(d)

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

v3.20.1
Disclosure Of Fair Value Of Assets And Liabilities (Schedule Of Valuation Techniques And Significant Unobservable Inputs) (Details) - Level 3 [Member]
$ in Thousands
Mar. 31, 2020
USD ($)
Minimum [Member] | Measurement Input, Discount Rate [Member]  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
Office properties held for sale 7.5
Minimum [Member] | Measurement Input, Cap Rate [Member]  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
Office properties held for sale 7.5
Minimum [Member] | Measurement Input, Market Rental Rate Per Square Foot [Member]  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
Office properties held for sale 26.00
Minimum [Member] | Measurement Input, Market Rates Per Residential Unit [Member]  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
Land held for sale, fair value $ 26,500
Minimum [Member] | Measurement Input, Market Rates Per Square Foot [Member]  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
Land properties held for sale 15.00
Maximum [Member] | Measurement Input, Discount Rate [Member]  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
Office properties held for sale 9.6
Maximum [Member] | Measurement Input, Cap Rate [Member]  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
Office properties held for sale 9
Maximum [Member] | Measurement Input, Market Rental Rate Per Square Foot [Member]  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
Office properties held for sale 50.00
Maximum [Member] | Measurement Input, Market Rates Per Residential Unit [Member]  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
Land held for sale, fair value $ 35,000
Maximum [Member] | Measurement Input, Market Rates Per Square Foot [Member]  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
Land properties held for sale 25.00