Indebtedness	9 Months Ended
Sep. 30, 2013
Indebtedness
Indebtedness	Note 6. Indebtedness Our principal debt obligations at September 30, 2013 were: (1) outstanding borrowings under our $750,000 unsecured revolving credit facility; (2) four public issuances of unsecured senior notes, including: (a) $250,000 principal amount at an annual interest rate of 4.30% due 2016, (b) $200,000 principal amount at an annual interest rate of 6.75% due 2020, (c) $300,000 principal amount at an annual interest rate of 6.75% due 2021 and (d) $350,000 principal amount at an annual interest rate of 5.625% due 2042; and (3) $684,615 aggregate principal amount of mortgages secured by 51 of our properties with maturity dates from 2013 to 2043. The 51 mortgaged properties had a carrying value of $950,736 at September 30, 2013. We also had two properties subject to capital leases totaling $13,436 at September 30, 2013; these two properties had a carrying value of $18,528 at September 30, 2013. In connection with the acquisitions discussed in Note 3 above, during the nine months ended September 30, 2013, we assumed $12,266 of mortgage debt, which was recorded at a fair value of $13,306. This mortgage has a contractual interest rate of 6.25% and matures in May 2015. We recorded the assumed mortgage at its fair value, which exceeded its outstanding principal balance by $1,040. We determined the fair value of the assumed mortgage using a market approach based upon Level 3 inputs (significant other unobservable inputs) in the fair value hierarchy. In June 2013, we prepaid mortgage notes encumbering four of our properties that had an aggregate principal balance of $10,377, a weighted average interest rate of 6.1% and maturity dates later in 2013. In September 2013, we prepaid a mortgage note encumbering two of our properties that had an aggregate principal balance of $13,579, a weighted average interest rate of 6.9% and a maturity date later in 2013. As a result, we recognized losses on early extinguishment of debt of $154 and $259 for the three and nine months ended September 30, 2013, respectively. On September 4, 2013, we amended the agreement governing our unsecured revolving credit facility with Wells Fargo Bank, National Association, as administrative agent, and a syndicate of other lenders. As a result of the amendment the stated maturity date of the revolving credit facility was extended from June 24, 2015 to January 15, 2018. Subject to the payment of an extension fee and meeting certain other conditions, we have an option to further extend the stated maturity date by an additional one year. The revolving credit facility agreement provides that we can borrow, repay and reborrow funds available under the revolving credit facility agreement until maturity, and no principal repayment is due until maturity. The $750,000 maximum amount of our revolving credit facility remained unchanged by the amendment. The revolving credit facility agreement continues to include a feature under which maximum borrowings under the facility may be increased to up to $1,500,000 in certain circumstances. Under this amendment, the interest rate paid on borrowings under the revolving credit facility agreement was reduced from LIBOR plus a premium of 160 basis points to LIBOR plus a premium of 130 basis points, and the facility fee was reduced from 35 basis points to 30 basis points per annum on the total amount of lending commitments. Both the interest rate premium and the facility fee are subject to adjustment based upon changes to our credit ratings. As a result of the amendment, we recognized a loss on early extinguishment of debt of $538 for the three and nine months ended September 30, 2013. The weighted average interest rate for borrowings under our revolving credit facility was 1.68% for the nine months ended September 30, 2013. We incurred interest expense and other associated costs related to our revolving credit facility of $271 and $555 for the three and nine months ended September 30, 2013. As of September 30, 2013 and October 30, 2013, we had $125,000 and $115,000 outstanding and $625,000 and $635,000 available under our revolving credit facility, respectively.

Note 6. Indebtedness

Our principal debt obligations at September 30, 2013 were: (1) outstanding borrowings under our $750,000 unsecured revolving credit facility; (2) four public issuances of unsecured senior notes, including: (a) $250,000 principal amount at an annual interest rate of 4.30% due 2016, (b) $200,000 principal amount at an annual interest rate of 6.75% due 2020, (c) $300,000 principal amount at an annual interest rate of 6.75% due 2021 and (d) $350,000 principal amount at an annual interest rate of 5.625% due 2042; and (3) $684,615 aggregate principal amount of mortgages secured by 51 of our properties with maturity dates from 2013 to 2043. The 51 mortgaged properties had a carrying value of $950,736 at September 30, 2013. We also had two properties subject to capital leases totaling $13,436 at September 30, 2013; these two properties had a carrying value of $18,528 at September 30, 2013.

In connection with the acquisitions discussed in Note 3 above, during the nine months ended September 30, 2013, we assumed $12,266 of mortgage debt, which was recorded at a fair value of $13,306. This mortgage has a contractual interest rate of 6.25% and matures in May 2015. We recorded the assumed mortgage at its fair value, which exceeded its outstanding principal balance by $1,040. We determined the fair value of the assumed mortgage using a market approach based upon Level 3 inputs (significant other unobservable inputs) in the fair value hierarchy.

In June 2013, we prepaid mortgage notes encumbering four of our properties that had an aggregate principal balance of $10,377, a weighted average interest rate of 6.1% and maturity dates later in 2013. In September 2013, we prepaid a mortgage note encumbering two of our properties that had an aggregate principal balance of $13,579, a weighted average interest rate of 6.9% and a maturity date later in 2013. As a result, we recognized losses on early extinguishment of debt of $154 and $259 for the three and nine months ended September 30, 2013, respectively.

On September 4, 2013, we amended the agreement governing our unsecured revolving credit facility with Wells Fargo Bank, National Association, as administrative agent, and a syndicate of other lenders. As a result of the amendment the stated maturity date of the revolving credit facility was extended from June 24, 2015 to January 15, 2018. Subject to the payment of an extension fee and meeting certain other conditions, we have an option to further extend the stated maturity date by an additional one year. The revolving credit facility agreement provides that we can borrow, repay and reborrow funds available under the revolving credit facility agreement until maturity, and no principal repayment is due until maturity. The $750,000 maximum amount of our revolving credit facility remained unchanged by the amendment. The revolving credit facility agreement continues to include a feature under which maximum borrowings under the facility may be increased to up to $1,500,000 in certain circumstances. Under this amendment, the interest rate paid on borrowings under the revolving credit facility agreement was reduced from LIBOR plus a premium of 160 basis points to LIBOR plus a premium of 130 basis points, and the facility fee was reduced from 35 basis points to 30 basis points per annum on the total amount of lending commitments. Both the interest rate premium and the facility fee are subject to adjustment based upon changes to our credit ratings. As a result of the amendment, we recognized a loss on early extinguishment of debt of $538 for the three and nine months ended September 30, 2013. The weighted average interest rate for borrowings under our revolving credit facility was 1.68% for the nine months ended September 30, 2013. We incurred interest expense and other associated costs related to our revolving credit facility of $271 and $555 for the three and nine months ended September 30, 2013. As of September 30, 2013 and October 30, 2013, we had $125,000 and $115,000 outstanding and $625,000 and $635,000 available under our revolving credit facility, respectively.