Summary of Significant Accounting Policies - Equity Method Investments and Equity Securities (Details)	Dec. 31, 2021 shares
Sonesta International Hotels Corporation
Debt and Equity Securities, FV-NI [Line Items]
Noncontrolling interest, ownership percentage	34.00%
TravelCenters of America LLC
Debt and Equity Securities, FV-NI [Line Items]
Number of common shares owned (in shares)	1,184,797

Balance held at close of period in number of shares.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 946
-SubTopic 210
-Section 50
-Paragraph 6
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=99383244&loc=d3e12121-115841

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 946
-SubTopic 320
-Section S99
-Paragraph 3
-Subparagraph (SX 210.12-12B(Column B))
-URI http://asc.fasb.org/extlink&oid=122147990&loc=d3e611197-123010

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant