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Shareholders' Equity - Narrative (Details) $ / shares in Units, $ in Thousands				6 Months Ended
	Jul. 27, 2020 USD ($) $ / shares	May 21, 2020 USD ($)	Feb. 20, 2020 USD ($)	Jun. 30, 2020 USD ($) shares	Jun. 30, 2019 USD ($)	May 19, 2020 trustee $ / shares shares	Jan. 01, 2020 USD ($) shares	Dec. 31, 2019 USD ($) shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of trustees | trustee						6
Common shares of beneficial interest, shares issued (in shares) | shares				237,951,968		10,000		237,897,163
Common shares of beneficial interest, par value (in dollars per share) | $ / shares						$ 2.94
Common stock value				$ 2,380				$ 2,379
Distributions to shareholders		$ 2,379	$ 35,684	$ 38,063	$ 128,373
Subsequent Event
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Distributions to common shareholders declared (in dollars per share) | $ / shares	$ 0.01
Distributions to shareholders	$ 2,380
Five Star
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common shares of beneficial interest, shares issued (in shares) | shares							10,268,158
Shareholders | Five Star
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common shares of beneficial interest, shares issued (in shares) | shares							16,118,849
Common stock value							$ 59,801

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Aggregate dividends declared during the period for each share of common stock outstanding.

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