Unsecured Revolving Credit Facility And Term Loans (Schedule Of Interest Rates On Outstanding Borrowings, Alternate Base Rate Loans, And Facility Fee) (Details) - 2017 Credit Facility [Member]
|
12 Months Ended |
Dec. 31, 2018 |
|---|
| Line of Credit Facility [Line Items] |
|
| Facility Fee Basis Points |
0.25%
|
| 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%
|
| 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)
|
| Interest Rate - Applicable Basis Points Above LIBOR |
1.20%
|
| Facility Fee Basis Points |
0.25%
|
| 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%
|
| 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%
|
| 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%
|
| 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%
|
| Base Rate [Member] | Baa3 [Member] | BBB- [Member] |
|
| Line of Credit Facility [Line Items] |
|
| Interest Rate - Applicable Basis Points Above LIBOR |
0.20%
|
| Base Rate [Member] | Baa2 [Member] | BBB [Member] |
|
| Line of Credit Facility [Line Items] |
|
| Interest Rate - Applicable Basis Points Above LIBOR |
0.00%
|
| Base Rate [Member] | Baa1 [Member] | BBB+ [Member] |
|
| Line of Credit Facility [Line Items] |
|
| Interest Rate - Applicable Basis Points Above LIBOR |
0.00%
|
| 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%
|