Quarterly report pursuant to Section 13 or 15(d)

Unsecured Revolving Credit Facility (Change In The Operating Partnership's Unsecured Debt Ratings) (Details)

v2.4.0.6
Unsecured Revolving Credit Facility (Change In The Operating Partnership's Unsecured Debt Ratings) (Details)
 6 Months Ended
Jun. 30, 2012
No Ratings Or Less Than BBB-/Baa3 [Member]
  
Guarantor Obligations [Line Items]  
Unsecured Debt Ratings No ratings or less than BBB-/Baa3
Interest Rate - Applicable Basis Points Above LIBOR 185.0
Facility Fee Basis Points 45.0
BBB- Or Baa3 [Member]
  
Guarantor Obligations [Line Items]  
Unsecured Debt Ratings BBB- or Baa3
Interest Rate - Applicable Basis Points Above LIBOR 150.0
Facility Fee Basis Points 35.0
BBB Or Baa2 (Current) [Member]
  
Guarantor Obligations [Line Items]  
Unsecured Debt Ratings BBB or Baa2(current)
Interest Rate - Applicable Basis Points Above LIBOR 125.0
Facility Fee Basis Points 25.0
BBB+ Or Baa1 [Member]
  
Guarantor Obligations [Line Items]  
Unsecured Debt Ratings BBB+or Baa1
Interest Rate - Applicable Basis Points Above LIBOR 107.5
Facility Fee Basis Points 20.0
A- Or A3 Or Higher [Member]
  
Guarantor Obligations [Line Items]  
Unsecured Debt Ratings A-or A3 or higher
Interest Rate - Applicable Basis Points Above LIBOR 100.0
Facility Fee Basis Points 17.5