Discontinued Operations - Schedule of Discontinued Operations (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Equity in earnings of Select Income REIT	$ (1,259)	$ (2,269)	$ (13)
Net gain on issuance of shares by Select Income REIT	0	29	72
Loss on sale of Select Income REIT shares	0	(15,180)	0
Income from discontinued operations	0	5,722	21,829
SIR | Discontinued Operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Equity in earnings of Select Income REIT	0	24,358	21,584
Net gain on issuance of shares by Select Income REIT	0	29	72
Loss on sale of Select Income REIT shares	0	(18,665)	0
Income from property discontinued operations	0	0	173
Income from discontinued operations	$ 0	$ 5,722	$ 21,829