Quarterly report pursuant to Section 13 or 15(d)

Unsecured Revolving Credit Facility And Term Loans (Schedule Of Interest Rate On Outstanding Borrowings Payable) (Details)

v3.8.0.1
Unsecured Revolving Credit Facility And Term Loans (Schedule Of Interest Rate On Outstanding Borrowings Payable) (Details)
 9 Months Ended
Sep. 30, 2017
2016 Term Loan [Member]  
Line of Credit Facility [Line Items]  
Interest Rate - Applicable Basis Points Above LIBOR 1.40%
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
No Ratings Or Less Than Baa3 [Member] | 2016 Term Loan [Member] | No Ratings Or Less Than BBB- [Member]  
Line of Credit Facility [Line Items]  
Interest Rate - Applicable Basis Points Above LIBOR 1.85%
Baa3 [Member] | BBB- [Member]  
Line of Credit Facility [Line Items]  
Unsecured Debt Ratings BBB- or Baa3 (current interest rate based on Company's election)
Baa3 [Member] | 2016 Term Loan [Member] | BBB- [Member]  
Line of Credit Facility [Line Items]  
Interest Rate - Applicable Basis Points Above LIBOR 1.40%
Baa2 [Member] | BBB [Member]  
Line of Credit Facility [Line Items]  
Unsecured Debt Ratings BBB or Baa2
Baa2 [Member] | 2016 Term Loan [Member] | BBB [Member]  
Line of Credit Facility [Line Items]  
Interest Rate - Applicable Basis Points Above LIBOR 1.15%
Baa1 [Member] | BBB+ [Member]  
Line of Credit Facility [Line Items]  
Unsecured Debt Ratings BBB+ or Baa1
Baa1 [Member] | 2016 Term Loan [Member] | BBB+ [Member]  
Line of Credit Facility [Line Items]  
Interest Rate - Applicable Basis Points Above LIBOR 1.00%
A3 Or Higher [Member] | A- Or Higher [Member]  
Line of Credit Facility [Line Items]  
Unsecured Debt Ratings A- or A3 or higher
A3 Or Higher [Member] | 2016 Term Loan [Member] | A- Or Higher [Member]  
Line of Credit Facility [Line Items]  
Interest Rate - Applicable Basis Points Above LIBOR 0.90%