Quarterly report pursuant to Section 13 or 15(d)

Unsecured Revolving Credit Facility And Term Loans (Schedule Of Interest Rates On Outstanding Borrowings, Alternate Base Rate Loans, And Facility Fee) (Details)

v3.8.0.1
Unsecured Revolving Credit Facility And Term Loans (Schedule Of Interest Rates On Outstanding Borrowings, Alternate Base Rate Loans, And Facility Fee) (Details)
 9 Months Ended
Sep. 30, 2017
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 (current interest rate based on Company's election)
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
2017 Credit Facility [Member]  
Line of Credit Facility [Line Items]  
Interest Rate - Applicable Basis Points Above LIBOR 1.20%
Facility Fee Basis Points 0.25%
2017 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 1.55%
Facility Fee Basis Points 0.30%
2017 Credit Facility [Member] | Baa3 [Member] | BBB- [Member]  
Line of Credit Facility [Line Items]  
Unsecured Debt Ratings BBB- or Baa3 (current interest rate based on Company's election)
Interest Rate - Applicable Basis Points Above LIBOR 1.20%
Facility Fee Basis Points 0.25%
2017 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 1.00%
Facility Fee Basis Points 0.20%
2017 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 0.90%
Facility Fee Basis Points 0.15%
2017 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 0.875%
Facility Fee Basis Points 0.125%
2017 Credit Facility [Member] | Base Rate [Member] | No Ratings Or Less Than Baa3 [Member] | No Ratings Or Less Than BBB- [Member]  
Line of Credit Facility [Line Items]  
Interest Rate - Applicable Basis Points Above LIBOR 0.55%
2017 Credit Facility [Member] | Base Rate [Member] | Baa3 [Member] | BBB- [Member]  
Line of Credit Facility [Line Items]  
Interest Rate - Applicable Basis Points Above LIBOR 0.20%
2017 Credit Facility [Member] | Base Rate [Member] | Baa2 [Member] | BBB [Member]  
Line of Credit Facility [Line Items]  
Interest Rate - Applicable Basis Points Above LIBOR 0.00%
2017 Credit Facility [Member] | Base Rate [Member] | Baa1 [Member] | BBB+ [Member]  
Line of Credit Facility [Line Items]  
Interest Rate - Applicable Basis Points Above LIBOR 0.00%
2017 Credit Facility [Member] | Base Rate [Member] | A3 Or Higher [Member] | A- Or Higher [Member]  
Line of Credit Facility [Line Items]  
Interest Rate - Applicable Basis Points Above LIBOR 0.00%