Annual report pursuant to Section 13 and 15(d)

Unsecured Revolving Credit Facility And Term Loans (Schedule Of Defined Leverage Ratio, Including Interest Rate, Alternate Base Rate Loans, And Facility Fee) (Details)

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Unsecured Revolving Credit Facility And Term Loans (Schedule Of Defined Leverage Ratio, Including Interest Rate, Alternate Base Rate Loans, And Facility Fee) (Details) - 2017 Credit Facility [Member]
 12 Months Ended
Dec. 31, 2019
Debt Instrument [Line Items]  
Facility Fee Basis Points 0.25%
45% Unsecured Term Loan Leverage Ratio [Member]  
Debt Instrument [Line Items]  
Interest Rate - Applicable Basis Points Above LIBOR 1.25%
Facility Fee Basis Points 0.20%
45% Unsecured Term Loan Leverage Ratio [Member] | Maximum [Member]  
Debt Instrument [Line Items]  
Leverage ratio 45.00%
45% And 50% Unsecured Term Loan Leverage Ratio [Member]  
Debt Instrument [Line Items]  
Interest Rate - Applicable Basis Points Above LIBOR 1.30%
Facility Fee Basis Points 0.25%
45% And 50% Unsecured Term Loan Leverage Ratio [Member] | Minimum [Member]  
Debt Instrument [Line Items]  
Leverage ratio 45.00%
45% And 50% Unsecured Term Loan Leverage Ratio [Member] | Maximum [Member]  
Debt Instrument [Line Items]  
Leverage ratio 50.00%
50% And 55% Unsecured Term Loan Leverage Ratio [Member]  
Debt Instrument [Line Items]  
Interest Rate - Applicable Basis Points Above LIBOR 1.35%
Facility Fee Basis Points 0.30%
50% And 55% Unsecured Term Loan Leverage Ratio [Member] | Minimum [Member]  
Debt Instrument [Line Items]  
Leverage ratio 50.00%
50% And 55% Unsecured Term Loan Leverage Ratio [Member] | Maximum [Member]  
Debt Instrument [Line Items]  
Leverage ratio 55.00%
55% Unsecured Term Loan Leverage Ratio [Member]  
Debt Instrument [Line Items]  
Interest Rate - Applicable Basis Points Above LIBOR 1.60%
Facility Fee Basis Points 0.35%
55% Unsecured Term Loan Leverage Ratio [Member] | Minimum [Member]  
Debt Instrument [Line Items]  
Leverage ratio 55.00%
Base Rate [Member] | 45% Unsecured Term Loan Leverage Ratio [Member]  
Debt Instrument [Line Items]  
Interest Rate - Applicable Basis Points Above LIBOR 0.25%
Base Rate [Member] | 45% And 50% Unsecured Term Loan Leverage Ratio [Member]  
Debt Instrument [Line Items]  
Interest Rate - Applicable Basis Points Above LIBOR 0.30%
Base Rate [Member] | 50% And 55% Unsecured Term Loan Leverage Ratio [Member]  
Debt Instrument [Line Items]  
Interest Rate - Applicable Basis Points Above LIBOR 0.35%
Base Rate [Member] | 55% Unsecured Term Loan Leverage Ratio [Member]  
Debt Instrument [Line Items]  
Interest Rate - Applicable Basis Points Above LIBOR 0.60%