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)

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Disclosure Of Fair Value Of Assets And Liabilities (Schedule Of Valuation Techniques And Significant Unobservable Inputs) (Details) - Level 3 [Member]
$ in Thousands
Dec. 31, 2019
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 [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 [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