Unsecured Revolving Credit Facility (Change In The Operating Partnership's Unsecured Debt Ratings) (Details) (Unsecured Revolving Credit Facility [Member])	3 Months Ended
	Mar. 31, 2014
No Ratings Or Less Than BBB-/Baa3 [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%
BBB- Or Baa3 [Member]
Line of Credit Facility [Line Items]
Unsecured Debt Ratings	BBB- or Baa3
Interest Rate - Applicable Basis Points Above LIBOR	1.30%
Facility Fee Basis Points	0.30%
BBB Or Baa2 (Current) [Member]
Line of Credit Facility [Line Items]
Unsecured Debt Ratings	BBB or Baa2(current)
Interest Rate - Applicable Basis Points Above LIBOR	1.10%
Facility Fee Basis Points	0.20%
BBB+ Or Baa1 [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%
A-Or A3 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%