Property Dispositions - Narrative (Details) $ in Thousands	1 Months Ended	3 Months Ended
	Mar. 31, 2020 USD ($) Bed	Mar. 31, 2020 USD ($) Bed	Mar. 31, 2019 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of beds | Bed	111,900	111,900
Gain from disposition of real estate		$ 48,525	$ 0
The Varsity | Owned properties | Disposal Group, Not Discontinued Operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of beds | Bed	901	901
Purchase price of property	$ 148,000	$ 148,000
Net proceeds	146,100
Gain from disposition of real estate	$ 48,500