Credit Facility (Credit Facility)	6 Months Ended
Credit Facility (Credit Facility)	Jun. 30, 2013
Credit Facility
Debt instrument
Credit Facility	6. Credit Facility We have a $1 billion unsecured acquisition credit facility, with an initial term that 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 June 30, 2013, credit facility origination costs of $7.0 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 billion credit facility. At June 30, 2013, we had a borrowing capacity of $299.0 million available on our credit facility (subject to customary conditions to borrowing) and an outstanding balance of $701.0 million, as compared to an outstanding balance of $158.0 million at December 31, 2012. In July 2013, we issued $750.0 million of 4.65% senior unsecured notes due 2023, and the proceeds were used to repay all outstanding borrowings on the credit facility on July 16, 2013. The weighted average interest rate on outstanding borrowings under our credit facility was 1.3% during the first six months of 2013 and 1.9% during the first six months of 2012. At June 30, 2013, the effective interest rate was 1.3%. Our current and prior credit facilities are and were subject to various leverage and interest coverage ratio limitations. At June 30, 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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