Credit Facility (Credit Facility)	12 Months Ended
Credit Facility (Credit Facility)	Dec. 31, 2013
Credit Facility
Debt instrument
Credit Facility	6. Credit Facility In October 2013, we increased our unsecured acquisition credit facility from $1.0 billion to $1.5 billion. The initial term of the credit facility expires in May 2016 and includes, at our election, a one-year extension option. Under this credit facility, our current investment grade credit ratings provide for financing at the London Interbank Offered Rate, commonly referred to as LIBOR, plus 1.075% with a facility commitment fee of 0.175%, for all-in drawn pricing of 1.25% over LIBOR. The borrowing rate is not subject to an interest rate floor or ceiling. We also have other interest rate options available to us under this credit facility. Our credit facility is unsecured and, accordingly, we have not pledged any assets as collateral for this obligation. At December 31, 2013, credit facility origination costs of $7.1 million are included in other assets, net, on our consolidated balance sheet. These costs are being amortized over the remaining term of our current $1.5 billion credit facility. At December 31, 2013, we had a borrowing capacity of $1.372 billion available on our credit facility (subject to customary conditions to borrowing) and an outstanding balance of $128.0 million, as compared to an outstanding balance of $158.0 million at December 31, 2012. The average interest rate on outstanding borrowings under our credit facilities was 1.3% during 2013, 1.6% during 2012, and was 2.1% during 2011. At December 31, 2013, the effective interest rate was 1.2%. Our current and prior credit facilities are and were subject to various leverage and interest coverage ratio limitations. At December 31, 2013, we remain in compliance with these covenants.

The entire disclosure for information about short-term and long-term debt arrangements, which includes amounts of borrowings under each line of credit, note payable, commercial paper issue, bonds indenture, debenture issue, own-share lending arrangements and any other contractual agreement to repay funds, and about the underlying arrangements, rationale for a classification as long-term, including repayment terms, interest rates, collateral provided, restrictions on use of assets and activities, whether or not in compliance with debt covenants, and other matters important to users of the financial statements, such as the effects of refinancing and noncompliance with debt covenants.

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