Subsequent Events - Recent Acquisition (Details) $ in Thousands		1 Months Ended	3 Months Ended
	May 07, 2019 USD ($) facility	Apr. 30, 2019 USD ($) state facility renewal_option	Mar. 31, 2019 USD ($) property	Mar. 31, 2018 USD ($)
Subsequent Event [Line Items]
Initial annual cash rents			$ 4,837
Number of properties acquired | property			5
Aggregate purchase price			$ 52,878
Borrowings under unsecured revolving credit facility			185,000	$ 60,000
Skilled Nursing Properties
Subsequent Event [Line Items]
Initial annual cash rents			$ 3,983
Number of properties acquired | property			4
Aggregate purchase price			$ 43,938
Multi-Service Campus Properties
Subsequent Event [Line Items]
Initial annual cash rents			$ 854
Number of properties acquired | property			1
Aggregate purchase price			$ 8,940
Subsequent Event
Subsequent Event [Line Items]
Number of states in transaction | state		2
Cash paid for acquisition		$ 211,000
Initial annual cash rents		19,000
Aggregate purchase price		$ 215,000
Subsequent Event | Skilled Nursing Properties
Subsequent Event [Line Items]
Cash paid for acquisition	$ 10,000
Initial annual cash rents	$ 900
Number of properties acquired | facility	1
Subsequent Event | Priority Management Group LLC | Louisiana
Subsequent Event [Line Items]
Remaining lease term (in years)		12 years 6 months
Subsequent Event | Priority Management Group LLC | Louisiana | Skilled Nursing Properties
Subsequent Event [Line Items]
Number of properties acquired | facility		7
Subsequent Event | Priority Management Group LLC | Louisiana | Multi-Service Campus Properties
Subsequent Event [Line Items]
Number of properties acquired | facility		1
Subsequent Event | Southwest LTC, Ltd | Texas
Subsequent Event [Line Items]
Remaining lease term (in years)		15 years
Number of lease renewal otions | renewal_option		2
Operating lease renewal term (in years)		5 years
Subsequent Event | Southwest LTC, Ltd | Texas | Skilled Nursing Properties
Subsequent Event [Line Items]
Number of properties acquired | facility		3
Subsequent Event | Southwest LTC, Ltd | Texas | Multi-Service Campus Properties
Subsequent Event [Line Items]
Number of properties acquired | facility		1