Credit Concentration - Schedule of ABR (Annualized Base Rent) (Details) - Sales Revenue, Services, Net $ in Thousands	9 Months Ended
	Sep. 30, 2020 USD ($) Rate
Concentration Risk [Line Items]
Total ABR (annualized base rent)	$ 303,176
Percent of ABR (annualized base rent) | Rate	100.00%
Customer Concentration Risk | CommonSpirit - CHI - Nebraska
Concentration Risk [Line Items]
Total ABR (annualized base rent)	$ 17,227
Percent of ABR (annualized base rent)	5.70%
Customer Concentration Risk | Northside Hospital
Concentration Risk [Line Items]
Total ABR (annualized base rent)	$ 14,627
Percent of ABR (annualized base rent)	4.80%
Customer Concentration Risk | UofL Health - Louisville, Inc.
Concentration Risk [Line Items]
Total ABR (annualized base rent)	$ 12,151
Percent of ABR (annualized base rent)	4.00%
Customer Concentration Risk | US Oncology
Concentration Risk [Line Items]
Total ABR (annualized base rent)	$ 9,741
Percent of ABR (annualized base rent)	3.20%
Customer Concentration Risk | Baylor Scott and White Health
Concentration Risk [Line Items]
Total ABR (annualized base rent)	$ 7,960
Percent of ABR (annualized base rent)	2.60%
Customer Concentration Risk | Remaining portfolio
Concentration Risk [Line Items]
Total ABR (annualized base rent)	$ 241,470
Percent of ABR (annualized base rent) | Rate	79.70%
Geographic Concentration Risk | Texas
Concentration Risk [Line Items]
Total ABR (annualized base rent)	$ 49,179
Percent of ABR (annualized base rent)	16.20%
Geographic Concentration Risk | Georgia
Concentration Risk [Line Items]
Total ABR (annualized base rent)	$ 25,564
Percent of ABR (annualized base rent)	8.40%
Geographic Concentration Risk | Indiana
Concentration Risk [Line Items]
Total ABR (annualized base rent)	$ 23,404
Percent of ABR (annualized base rent)	7.70%
Geographic Concentration Risk | Nebraska
Concentration Risk [Line Items]
Total ABR (annualized base rent)	$ 18,552
Percent of ABR (annualized base rent)	6.10%
Geographic Concentration Risk | Minnesota
Concentration Risk [Line Items]
Total ABR (annualized base rent)	$ 17,655
Percent of ABR (annualized base rent)	5.80%
Geographic Concentration Risk | Other
Concentration Risk [Line Items]
Total ABR (annualized base rent)	$ 168,822
Percent of ABR (annualized base rent)	55.80%