Related Person Transactions	9 Months Ended
Sep. 30, 2018
Related Party Transactions [Abstract]
Related Person Transactions	Note 10. Related Person Transactions We have relationships and historical and continuing transactions with TA, Sonesta, RMR LLC, The RMR Group Inc., or RMR Inc., AIC and others related to them, including other companies to which RMR LLC or its subsidiaries provide management services and which have trustees, directors and officers who are also our Trustees or officers. Mr. Mark L. Kleifges, our Chief Financial Officer and Treasurer, has announced his retirement from his positions with us effective December 31, 2018. TA. TA is our largest tenant and property operator, leasing 34% of our gross carrying value of real estate properties as of September 30, 2018. We lease all of our travel centers to TA under the TA leases. We are also TA’s largest shareholder; as of September 30, 2018, we owned 3,420,000 common shares of TA, representing approximately 8.6% of TA’s outstanding common shares. RMR LLC provides management services to both us and TA, and Adam D. Portnoy, one of our Managing Trustees, also serves as a managing director of TA. As of October 10, 2018, RMR LLC owned approximately 3.8% of TA's outstanding common shares. See Note 8 for further information regarding our relationships, agreements and transactions with TA and Note 13 for further information regarding our investment in TA. Sonesta. Sonesta is a private company owned in part by Adam D. Portnoy, one of our Managing Trustees. As of September 30, 2018, Sonesta managed 50 of our hotels pursuant to management and pooling agreements. See Note 8 for further information regarding our relationships, agreements and transactions with Sonesta. Our Manager, RMR LLC. We have two agreements with RMR LLC to provide management services to us. See Note 9 for further information regarding our management agreements with RMR LLC. We have historically granted share awards to our officers and other RMR LLC employees under our equity compensation plans. In September 2018 and 2017, we granted annual awards of 97,000 and 85,000 of our common shares, respectively, to our officers and other employees of RMR LLC. In September 2018 and 2017, we purchased 17,808 and 18,559 of our common shares, respectively, valued at the closing price of our common shares on Nasdaq on the applicable date of purchase in satisfaction of tax withholding and payment obligations in connection with the vesting of awards of our common shares to certain of our officers and other employees of RMR LLC. We include the amounts recognized as expense for share awards to our officers and other RMR LLC employees in general and administrative expenses in our condensed consolidated statements of comprehensive income. RMR Inc. RMR LLC is a majority owned subsidiary of RMR Inc. and RMR Inc. is the managing member of RMR LLC. Adam D. Portnoy, one of our Managing Trustees, is the sole trustee, an officer and the controlling shareholder of ABP Trust, which is the controlling shareholder of RMR Inc., and a managing director, president and chief executive officer of RMR Inc. and an officer of RMR LLC. John G. Murray, our other Managing Trustee and our President and Chief Executive Officer, also serves as an executive officer of RMR LLC. Other officers of RMR LLC also serve as our officers. As of September 30, 2018, we owned 2,503,777 shares of class A common stock of RMR Inc. See Note 13 for further information regarding our investment in RMR Inc. AIC. We, ABP Trust, TA and four other companies to which RMR LLC provides management services currently own AIC in equal amounts. We and the other AIC shareholders participate in a combined property insurance program arranged and reinsured in part by AIC. We paid aggregate annual premiums, including taxes and fees, of approximately $5,738 in connection with the renewal of this insurance program for the policy year ending June 30, 2019, which amount may be adjusted from time to time as we acquire and dispose of properties that are included in this insurance program. As of September 30, 2018 and December 31, 2017, our investment in AIC had a carrying value of $9,163 and $8,192, respectively. These amounts are included in other assets in our condensed consolidated balance sheets. We recognized income related to our investment in AIC, which is presented as equity in earnings of an investee in our condensed consolidated statements of comprehensive income. Our other comprehensive income includes our proportionate part of unrealized gains and (losses) on securities that are owned by AIC related to our investment in AIC. For further information about these and certain other such relationships and certain other related person transactions, refer to our 2017 Annual Report.

Note 10. Related Person Transactions

We have relationships and historical and continuing transactions with TA, Sonesta, RMR LLC, The RMR Group Inc., or RMR Inc., AIC and others related to them, including other companies to which RMR LLC or its subsidiaries provide management services and which have trustees, directors and officers who are also our Trustees or officers. Mr. Mark L. Kleifges, our Chief Financial Officer and Treasurer, has announced his retirement from his positions with us effective December 31, 2018.

TA. TA is our largest tenant and property operator, leasing 34% of our gross carrying value of real estate properties as of September 30, 2018. We lease all of our travel centers to TA under the TA leases. We are also TA’s largest shareholder; as of September 30, 2018, we owned 3,420,000 common shares of TA, representing approximately 8.6% of TA’s outstanding common shares. RMR LLC provides management services to both us and TA, and Adam D. Portnoy, one of our Managing Trustees, also serves as a managing director of TA. As of October 10, 2018, RMR LLC owned approximately 3.8% of TA's outstanding common shares. See Note 8 for further information regarding our relationships, agreements and transactions with TA and Note 13 for further information regarding our investment in TA.

Sonesta. Sonesta is a private company owned in part by Adam D. Portnoy, one of our Managing Trustees. As of September 30, 2018, Sonesta managed 50 of our hotels pursuant to management and pooling agreements. See Note 8 for further information regarding our relationships, agreements and transactions with Sonesta.

Our Manager, RMR LLC. We have two agreements with RMR LLC to provide management services to us. See Note 9 for further information regarding our management agreements with RMR LLC.

We have historically granted share awards to our officers and other RMR LLC employees under our equity compensation plans. In September 2018 and 2017, we granted annual awards of 97,000 and 85,000 of our common shares, respectively, to our officers and other employees of RMR LLC. In September 2018 and 2017, we purchased 17,808 and 18,559 of our common shares, respectively, valued at the closing price of our common shares on Nasdaq on the applicable date of purchase in satisfaction of tax withholding and payment obligations in connection with the vesting of awards of our common shares to certain of our officers and other employees of RMR LLC. We include the amounts recognized as expense for share awards to our officers and other RMR LLC employees in general and administrative expenses in our condensed consolidated statements of comprehensive income.

RMR Inc. RMR LLC is a majority owned subsidiary of RMR Inc. and RMR Inc. is the managing member of RMR LLC. Adam D. Portnoy, one of our Managing Trustees, is the sole trustee, an officer and the controlling shareholder of ABP Trust, which is the controlling shareholder of RMR Inc., and a managing director, president and chief executive officer of RMR Inc. and an officer of RMR LLC. John G. Murray, our other Managing Trustee and our President and Chief Executive Officer, also serves as an executive officer of RMR LLC. Other officers of RMR LLC also serve as our officers. As of September 30, 2018, we owned 2,503,777 shares of class A common stock of RMR Inc. See Note 13 for further information regarding our investment in RMR Inc.

AIC. We, ABP Trust, TA and four other companies to which RMR LLC provides management services currently own AIC in equal amounts. We and the other AIC shareholders participate in a combined property insurance program arranged and reinsured in part by AIC. We paid aggregate annual premiums, including taxes and fees, of approximately $5,738 in connection with the renewal of this insurance program for the policy year ending June 30, 2019, which amount may be adjusted from time to time as we acquire and dispose of properties that are included in this insurance program.

As of September 30, 2018 and December 31, 2017, our investment in AIC had a carrying value of $9,163 and $8,192, respectively. These amounts are included in other assets in our condensed consolidated balance sheets. We recognized income related to our investment in AIC, which is presented as equity in earnings of an investee in our condensed consolidated statements of comprehensive income. Our other comprehensive income includes our proportionate part of unrealized gains and (losses) on securities that are owned by AIC related to our investment in AIC.

For further information about these and certain other such relationships and certain other related person transactions, refer to our 2017 Annual Report.