Indebtedness	6 Months Ended
Jun. 30, 2015
Indebtedness
Indebtedness	Note 6. Indebtedness Our principal debt obligations at June 30, 2015 were: (1) our $319,000 of outstanding borrowings under our $750,000 unsecured revolving credit facility; (2) our $400,000 unsecured term loan; (3) an aggregate outstanding principal amount of $2,425,000 of public issuances of senior unsecured notes; and (4) an aggregate outstanding principal amount of $8,478 of public issuances of convertible senior unsecured notes. Our $750,000 unsecured revolving credit facility is available for general business purposes, including acquisitions. The maturity date of our unsecured revolving credit facility is July 15, 2018 and, subject to the payment of an extension fee and meeting certain other conditions, we have an option to extend the stated maturity date by one year to July 15, 2019. Borrowings under our unsecured revolving credit facility bear interest at a rate of LIBOR plus a premium, which was 110 basis points at June 30, 2015. We also pay a facility fee on the total amount of lending commitments, which was 20 basis points per annum at June 30, 2015. Both the interest rate premium and the facility fee are subject to adjustment based upon changes to our credit ratings. As of June 30, 2015, the interest rate payable on borrowings under our unsecured revolving credit facility was 1.29%. The weighted average annual interest rate for borrowings under our unsecured revolving credit facility was 1.28% for both the three and six months ended June 30, 2015 and 1.25% for both the three and six months ended June 30, 2014. As of June 30, 2015 and August 9, 2015, we had $319,000 and $334,000 outstanding under our unsecured revolving credit facility, respectively. Our $400,000 unsecured term loan, which matures on April 15, 2019, is prepayable without penalty at any time. The amount outstanding under our unsecured term loan bears interest at a rate of LIBOR plus a premium, which was 120 basis points at June 30, 2015. The interest rate premium is subject to adjustment based on changes to our credit ratings. As of June 30, 2015, the annual interest rate for the amount outstanding under our unsecured term loan was 1.38%. The weighted average annual interest rate for borrowings under our unsecured term loan was 1.38% for both the three and six months ended June 30, 2015, and 1.35% and 1.36% for the three and six months ended June 30, 2014, respectively. Our credit agreement for our unsecured revolving credit facility and unsecured term loan also includes a feature under which maximum borrowings under our unsecured revolving credit facility and unsecured term loan may be increased up to $2,300,000 on a combined basis in certain circumstances. Our credit agreement for our unsecured revolving credit facility and unsecured term loan and our unsecured notes indenture and its supplements provide for acceleration of payment of all amounts outstanding upon the occurrence and continuation of certain events of default, including, in the case of our credit agreement, a change of control of us, which includes RMR LLC ceasing to act as our business manager. Our credit agreement for our unsecured revolving credit facility and unsecured term loan and our senior unsecured notes indenture and its supplements also 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 credit agreement for our unsecured revolving credit facility and unsecured term loan and our senior unsecured notes indenture and its supplements at June 30, 2015.

Note 6. Indebtedness

Our principal debt obligations at June 30, 2015 were: (1) our $319,000 of outstanding borrowings under our $750,000 unsecured revolving credit facility; (2) our $400,000 unsecured term loan; (3) an aggregate outstanding principal amount of $2,425,000 of public issuances of senior unsecured notes; and (4) an aggregate outstanding principal amount of $8,478 of public issuances of convertible senior unsecured notes.

Our $750,000 unsecured revolving credit facility is available for general business purposes, including acquisitions. The maturity date of our unsecured revolving credit facility is July 15, 2018 and, subject to the payment of an extension fee and meeting certain other conditions, we have an option to extend the stated maturity date by one year to July 15, 2019. Borrowings under our unsecured revolving credit facility bear interest at a rate of LIBOR plus a premium, which was 110 basis points at June 30, 2015. We also pay a facility fee on the total amount of lending commitments, which was 20 basis points per annum at June 30, 2015. Both the interest rate premium and the facility fee are subject to adjustment based upon changes to our credit ratings. As of June 30, 2015, the interest rate payable on borrowings under our unsecured revolving credit facility was 1.29%. The weighted average annual interest rate for borrowings under our unsecured revolving credit facility was 1.28% for both the three and six months ended June 30, 2015 and 1.25% for both the three and six months ended June 30, 2014. As of June 30, 2015 and August 9, 2015, we had $319,000 and $334,000 outstanding under our unsecured revolving credit facility, respectively.

Our $400,000 unsecured term loan, which matures on April 15, 2019, is prepayable without penalty at any time. The amount outstanding under our unsecured term loan bears interest at a rate of LIBOR plus a premium, which was 120 basis points at June 30, 2015. The interest rate premium is subject to adjustment based on changes to our credit ratings. As of June 30, 2015, the annual interest rate for the amount outstanding under our unsecured term loan was 1.38%. The weighted average annual interest rate for borrowings under our unsecured term loan was 1.38% for both the three and six months ended June 30, 2015, and 1.35% and 1.36% for the three and six months ended June 30, 2014, respectively.

Our credit agreement for our unsecured revolving credit facility and unsecured term loan also includes a feature under which maximum borrowings under our unsecured revolving credit facility and unsecured term loan may be increased up to $2,300,000 on a combined basis in certain circumstances. Our credit agreement for our unsecured revolving credit facility and unsecured term loan and our unsecured notes indenture and its supplements provide for acceleration of payment of all amounts outstanding upon the occurrence and continuation of certain events of default, including, in the case of our credit agreement, a change of control of us, which includes RMR LLC ceasing to act as our business manager. Our credit agreement for our unsecured revolving credit facility and unsecured term loan and our senior unsecured notes indenture and its supplements also 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 credit agreement for our unsecured revolving credit facility and unsecured term loan and our senior unsecured notes indenture and its supplements at June 30, 2015.