Related Person Transactions	6 Months Ended
Related Person Transactions	Jun. 30, 2017
Related Party Transactions [Abstract]
Related Person Transactions	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 provides management services and which have trustees, directors and officers who are also our Trustees or officers. TA. TA is our largest tenant and property operator, leasing 36% of our gross carrying value of real estate properties as of June 30, 2017. We lease all of our travel centers to TA under the TA leases. We are also TA’s largest shareholder; as of June 30, 2017, 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. See Notes 7 and 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 by our Managing Trustees. As of June 30, 2017, Sonesta managed 35 of our hotels pursuant to management and pooling agreements. See Notes 7 and 8 for further information regarding our relationships, agreements and transactions with Sonesta. Our Manager, RMR LLC. See Note 9 for further information regarding our management agreements with RMR LLC. RMR Inc. RMR LLC is a subsidiary of RMR Inc. and RMR Inc. is the managing member of RMR LLC. The controlling shareholder of RMR Inc., ABP Trust, is owned by our Managing Trustees. As of June 30, 2017, we hold 2,503,777 shares of class A common stock of RMR Inc. See Note 13 for further information regarding our investment in RMR Inc. In June 2017, we and our manager, RMR LLC, became aware that we had been a victim of a criminal fraud that law enforcement authorities refer to as business email compromise fraud. This fraud involved a person pretending to be the representative of the seller in one of our property acquisition transactions and such imposter providing fraudulent wire instructions to one of our senior officers. As a result, funds were sent by wire transfer to an account that was believed to be, but in fact was not, the seller’s account. RMR LLC reimbursed us during the second quarter of 2017 for this fraudulent wire payment. As a result of the reimbursement, this matter had no effect on our condensed consolidated financial statements. AIC. We, ABP Trust, TA and four other companies to which RMR LLC provides management services currently own AIC, an Indiana insurance company, in equal amounts. We and the other AIC shareholders participate in a combined property insurance program arranged and reinsured in part by AIC. We currently expect to pay aggregate annual premiums, including taxes and fees, of approximately $6,352 in connection with this insurance program for the policy year ending June 30, 2018, 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 June 30, 2017 and December 31, 2016, our investment in AIC had a carrying value of $7,805 and $7,123, respectively. These amounts are included in other assets in our condensed consolidated balance sheets. We recognized income related to our investment in AIC, which amounts are 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 on securities which are owned and held for sale by AIC. For further information about these and certain other related person relationships and transactions, please refer to our 2016 Annual Report.