Credit Concentration - Schedule of ABR (Annualized Base Rent) (Details) - Sales Revenue, Services, Net $ in Thousands	6 Months Ended
	Jun. 30, 2017 USD ($) Rate
Concentration Risk [Line Items]
Total ABR (annualized base rent) | $	$ 259,565
Percent of ABR (annualized base rent) | Rate	100.00%
Customer Concentration Risk | CHI - Nebraska
Concentration Risk [Line Items]
Total ABR (annualized base rent) | $	$ 14,829
Percent of ABR (annualized base rent) | Rate	5.70%
Customer Concentration Risk | CHI - KentuckyOne Health
Concentration Risk [Line Items]
Total ABR (annualized base rent) | $	$ 13,120
Percent of ABR (annualized base rent) | Rate	5.10%
Customer Concentration Risk | Baylor Scott and White Health
Concentration Risk [Line Items]
Total ABR (annualized base rent) | $	$ 6,730
Percent of ABR (annualized base rent) | Rate	2.60%
Customer Concentration Risk | US Oncology
Concentration Risk [Line Items]
Total ABR (annualized base rent) | $	$ 6,573
Percent of ABR (annualized base rent) | Rate	2.50%
Customer Concentration Risk | CHI - St. Alexius (North Dakota)
Concentration Risk [Line Items]
Total ABR (annualized base rent) | $	$ 6,235
Percent of ABR (annualized base rent) | Rate	2.40%
Customer Concentration Risk | Remaining portfolio
Concentration Risk [Line Items]
Total ABR (annualized base rent) | $	$ 212,078
Percent of ABR (annualized base rent) | Rate	81.70%
Geographic Concentration Risk | Texas
Concentration Risk [Line Items]
Total ABR (annualized base rent) | $	$ 43,544
Percent of ABR (annualized base rent) | Rate	16.80%
Geographic Concentration Risk | Indiana
Concentration Risk [Line Items]
Total ABR (annualized base rent) | $	$ 16,587
Percent of ABR (annualized base rent) | Rate	6.40%
Geographic Concentration Risk | Nebraska
Concentration Risk [Line Items]
Total ABR (annualized base rent) | $	$ 16,293
Percent of ABR (annualized base rent) | Rate	6.30%
Geographic Concentration Risk | Indiana
Concentration Risk [Line Items]
Total ABR (annualized base rent) | $	$ 15,969
Percent of ABR (annualized base rent) | Rate	6.20%
Geographic Concentration Risk | Kentucky
Concentration Risk [Line Items]
Total ABR (annualized base rent) | $	$ 14,203
Percent of ABR (annualized base rent) | Rate	5.50%
Geographic Concentration Risk | Other
Concentration Risk [Line Items]
Total ABR (annualized base rent) | $	$ 152,969
Percent of ABR (annualized base rent) | Rate	58.80%