Quarterly report pursuant to Section 13 or 15(d)

Unsecured Lines of Credit Payable (Narrative) (Details)

 v2.3.0.11
Unsecured Lines of Credit Payable (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
6 Months Ended
Jun. 30, 2011
Jun. 30, 2011
Senior Notes [Member]
Jul. 01, 2011
Unsecured Line of Credit [Member]
Jun. 30, 2011
Unsecured Line of Credit [Member]
Stated interest rates   5.95%    
Maturity date of notes Jun. 15, 2011
Committed capacity     $ 400.0 $ 400.0