Indebtedness	6 Months Ended
Jun. 30, 2013
Indebtedness
Indebtedness	Note 6. Indebtedness We have a $750,000 unsecured revolving credit facility that is available for general business purposes, including acquisitions. The maturity date of our revolving credit facility is September 7, 2015 and, subject to the payment of an extension fee and meeting certain other conditions, includes an option for us to extend the stated maturity date by one year to September 7, 2016. In addition, our revolving credit facility includes a feature under which maximum borrowings may be increased to up to $1,500,000 in certain circumstances. Borrowings under our revolving credit facility bear interest at a rate of LIBOR plus a premium of 130 basis points. We also pay a facility fee of 30 basis points per annum on the total amount of lending commitments under our revolving credit facility. Both the interest rate premium and the facility fee are subject to adjustment based upon changes to our credit ratings. As of June 30, 2013, the interest rate payable on borrowings under our revolving credit facility was 1.50%. The weighted average annual interest rate for borrowings under our revolving credit facility was 1.50% and 1.51% for the three and six months ended June 30, 2013, respectively, and 1.58% for the six months ended June 30, 2012. We had no amounts outstanding under our revolving credit facility during the three months ended June 30, 2012. As of June 30, 2013, we had $90,000 outstanding and $660,000 available under our revolving credit facility. We have a $400,000 unsecured term loan. Our term loan matures on March 13, 2017, and is prepayable without penalty at any time. In addition, our term loan includes a feature under which maximum borrowings may be increased to up to $500,000 in certain circumstances. Our term loan bears interest at a rate of LIBOR plus a premium, which was 145 basis points as of June 30, 2013. As of June 30, 2013, the interest rate for the amount outstanding under our term loan was 1.65%. The weighted average interest rate for the amount outstanding under our term loan was 1.66% for both the three and six months ended June 30, 2013 and 1.70% for both the three months ended June 30, 2012 and the period March 12, 2012 (the date we entered into the term loan agreement) to June 30, 2012, respectively. Our credit facility agreement and our term loan agreement provide for acceleration of payment of all amounts due thereunder upon the occurrence and continuation of certain events of default, including a change of control of us and the termination of our business management agreement with Reit Management & Research LLC, or RMR. Our revolving credit facility agreement and our term loan agreement contain a number of covenants that restrict our ability to incur debt in excess of calculated amounts, restrict our ability to make distributions under certain circumstances and generally require us to maintain certain financial ratios. We believe we were in compliance with the terms and conditions of our revolving credit facility agreement and our term loan agreement at June 30, 2013. On June 6, 2013, we issued $300,000 of 4.5% unsecured senior notes due 2023 in a public offering for net proceeds of $297,132 after underwriting and other offering expenses.

Note 6. Indebtedness

We have a $750,000 unsecured revolving credit facility that is available for general business purposes, including acquisitions. The maturity date of our revolving credit facility is September 7, 2015 and, subject to the payment of an extension fee and meeting certain other conditions, includes an option for us to extend the stated maturity date by one year to September 7, 2016. In addition, our revolving credit facility includes a feature under which maximum borrowings may be increased to up to $1,500,000 in certain circumstances. Borrowings under our revolving credit facility bear interest at a rate of LIBOR plus a premium of 130 basis points. We also pay a facility fee of 30 basis points per annum on the total amount of lending commitments under our revolving credit facility. Both the interest rate premium and the facility fee are subject to adjustment based upon changes to our credit ratings. As of June 30, 2013, the interest rate payable on borrowings under our revolving credit facility was 1.50%. The weighted average annual interest rate for borrowings under our revolving credit facility was 1.50% and 1.51% for the three and six months ended June 30, 2013, respectively, and 1.58% for the six months ended June 30, 2012. We had no amounts outstanding under our revolving credit facility during the three months ended June 30, 2012. As of June 30, 2013, we had $90,000 outstanding and $660,000 available under our revolving credit facility.

We have a $400,000 unsecured term loan. Our term loan matures on March 13, 2017, and is prepayable without penalty at any time. In addition, our term loan includes a feature under which maximum borrowings may be increased to up to $500,000 in certain circumstances. Our term loan bears interest at a rate of LIBOR plus a premium, which was 145 basis points as of June 30, 2013. As of June 30, 2013, the interest rate for the amount outstanding under our term loan was 1.65%. The weighted average interest rate for the amount outstanding under our term loan was 1.66% for both the three and six months ended June 30, 2013 and 1.70% for both the three months ended June 30, 2012 and the period March 12, 2012 (the date we entered into the term loan agreement) to June 30, 2012, respectively.

Our credit facility agreement and our term loan agreement provide for acceleration of payment of all amounts due thereunder upon the occurrence and continuation of certain events of default, including a change of control of us and the termination of our business management agreement with Reit Management & Research LLC, or RMR. Our revolving credit facility agreement and our term loan agreement contain a number of covenants that restrict our ability to incur debt in excess of calculated amounts, restrict our ability to make distributions under certain circumstances and generally require us to maintain certain financial ratios. We believe we were in compliance with the terms and conditions of our revolving credit facility agreement and our term loan agreement at June 30, 2013.

On June 6, 2013, we issued $300,000 of 4.5% unsecured senior notes due 2023 in a public offering for net proceeds of $297,132 after underwriting and other offering expenses.