Summary of Significant Accounting Policies - Narrative (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2018 USD ($) facility segment	Mar. 31, 2017 USD ($)	Dec. 31, 2017 USD ($)
Accounting Policies [Abstract]
Accumulated amortization of deferred financing costs	$ 3,600		$ 3,200
Straight-line rental income	591	$ 72
Deferred straight-line rent receivable	$ 1,100		500
Number of reportable segments | segment	1
Other Commitments [Line Items]
Number of living facilities | facility	188
Unpaid Base Rents
Other Commitments [Line Items]
Reserve on receivables	$ 800		800
Other Tenant Receivables
Other Commitments [Line Items]
Reserve on receivables	9,600		$ 9,600
Lease Agreements
Other Commitments [Line Items]
Remaining contractual payments as lessee	$ 300
Independent Living Facilities Owned and Operated by Company
Other Commitments [Line Items]
Number of living facilities | facility	3