Credit Concentration - Top Five Tenant Credit Concentrations (Details) - Sales Revenue, Services, Net $ in Thousands	12 Months Ended
	Dec. 31, 2018 USD ($)
Concentration Risk [Line Items]
Total ABR	$ 286,014
Percent of ABR	100.00%
CHI - Nebraska | Customer Concentration Risk
Concentration Risk [Line Items]
Total ABR	$ 16,336
Percent of ABR	5.70%
CHI - KentuckyOne Health | Customer Concentration Risk
Concentration Risk [Line Items]
Total ABR	$ 13,577
Percent of ABR	4.80%
Northside Hospital | Customer Concentration Risk
Concentration Risk [Line Items]
Total ABR	$ 10,086
Percent of ABR	3.50%
Northside Hospital | Customer Concentration Risk
Concentration Risk [Line Items]
Total ABR	$ 7,583
Percent of ABR	2.70%
Ascension - St. Vincent's - Indianapolis | Customer Concentration Risk
Concentration Risk [Line Items]
Total ABR	$ 7,291
Percent of ABR	2.50%
Remaining portfolio | Customer Concentration Risk
Concentration Risk [Line Items]
Total ABR	$ 231,141
Percent of ABR	80.80%