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)

v3.20.4
Unsecured Revolving Credit Facility And Term Loans (Schedule Of Defined Leverage Ratio, Including Interest Rate, Alternate Base Rate Loans, And Facility Fee) (Details)
 12 Months Ended
Dec. 31, 2020
50% And 55% (Current ratio) Unsecured Term Loan Leverage Ratio [Member] | Minimum [Member]  
Debt Instrument [Line Items]  
Leverage ratio 50.00%
50% And 55% (Current ratio) Unsecured Term Loan Leverage Ratio [Member] | Maximum [Member]  
Debt Instrument [Line Items]  
Leverage ratio 55.00%
2017 Credit Facility [Member]  
Debt Instrument [Line Items]  
Facility Fee Basis Points 0.25%
2017 Credit Facility [Member] | 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%
2017 Credit Facility [Member] | 45% Unsecured Term Loan Leverage Ratio [Member] | Maximum [Member]  
Debt Instrument [Line Items]  
Leverage ratio 45.00%
2017 Credit Facility [Member] | 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%
2017 Credit Facility [Member] | 45% And 50% Unsecured Term Loan Leverage Ratio [Member] | Minimum [Member]  
Debt Instrument [Line Items]  
Leverage ratio 45.00%
2017 Credit Facility [Member] | 45% And 50% Unsecured Term Loan Leverage Ratio [Member] | Maximum [Member]  
Debt Instrument [Line Items]  
Leverage ratio 50.00%
2017 Credit Facility [Member] | 50% And 55% (Current ratio) 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%
2017 Credit Facility [Member] | 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%
2017 Credit Facility [Member] | 55% Unsecured Term Loan Leverage Ratio [Member] | Minimum [Member]  
Debt Instrument [Line Items]  
Leverage ratio 55.00%
2017 Credit Facility [Member] | Base Rate [Member] | 45% Unsecured Term Loan Leverage Ratio [Member]  
Debt Instrument [Line Items]  
Interest Rate - Applicable Basis Points Above LIBOR 0.25%
2017 Credit Facility [Member] | 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%
2017 Credit Facility [Member] | Base Rate [Member] | 50% And 55% (Current ratio) Unsecured Term Loan Leverage Ratio [Member]  
Debt Instrument [Line Items]  
Interest Rate - Applicable Basis Points Above LIBOR 0.35%
2017 Credit Facility [Member] | Base Rate [Member] | 55% Unsecured Term Loan Leverage Ratio [Member]  
Debt Instrument [Line Items]  
Interest Rate - Applicable Basis Points Above LIBOR 0.60%