Quarterly report pursuant to Section 13 or 15(d)

Unsecured Revolving Credit Facility And Term Loans (Schedule Of Unsecured Credit Rating And Facility Fee) (Details)

v3.8.0.1
Unsecured Revolving Credit Facility And Term Loans (Schedule Of Unsecured Credit Rating And Facility Fee) (Details)
 3 Months Ended
Mar. 31, 2018
No Ratings Or Less Than Baa3 [Member] | No Ratings Or Less Than BBB- [Member]  
Line of Credit Facility [Line Items]  
Unsecured Debt Ratings No ratings or less than BBB-/Baa3
Baa3 [Member] | BBB- [Member]  
Line of Credit Facility [Line Items]  
Unsecured Debt Ratings BBB- or Baa3 (interest rate based on Company's election through March 5, 2018)
Baa2 [Member] | BBB [Member]  
Line of Credit Facility [Line Items]  
Unsecured Debt Ratings BBB or Baa2
Baa1 [Member] | BBB+ [Member]  
Line of Credit Facility [Line Items]  
Unsecured Debt Ratings BBB+ or Baa1
A3 Or Higher [Member] | A- Or Higher [Member]  
Line of Credit Facility [Line Items]  
Unsecured Debt Ratings A- or A3 or higher
Unsecured Revolving Credit Facility [Member] | No Ratings Or Less Than Baa3 [Member] | No Ratings Or Less Than BBB- [Member]  
Line of Credit Facility [Line Items]  
Unsecured Debt Ratings No ratings or less than BBB-/Baa3
Interest Rate - Applicable Basis Points Above LIBOR 1.70%
Facility Fee Basis Points 0.35%
Unsecured Revolving Credit Facility [Member] | Baa3 [Member] | BBB- [Member]  
Line of Credit Facility [Line Items]  
Unsecured Debt Ratings BBB- or Baa3 (since January 2017 amendment)
Interest Rate - Applicable Basis Points Above LIBOR 1.30%
Facility Fee Basis Points 0.30%
Unsecured Revolving Credit Facility [Member] | Baa2 [Member] | BBB [Member]  
Line of Credit Facility [Line Items]  
Unsecured Debt Ratings BBB or Baa2
Interest Rate - Applicable Basis Points Above LIBOR 1.10%
Facility Fee Basis Points 0.20%
Unsecured Revolving Credit Facility [Member] | Baa1 [Member] | BBB+ [Member]  
Line of Credit Facility [Line Items]  
Unsecured Debt Ratings BBB+ or Baa1
Interest Rate - Applicable Basis Points Above LIBOR 1.00%
Facility Fee Basis Points 0.15%
Unsecured Revolving Credit Facility [Member] | A3 Or Higher [Member] | A- Or Higher [Member]  
Line of Credit Facility [Line Items]  
Unsecured Debt Ratings A- or A3 or higher
Interest Rate - Applicable Basis Points Above LIBOR 0.925%
Facility Fee Basis Points 0.125%