Investment Activity - Schedule of Future Minimum Payments for Operating Leases (Details) $ in Thousands	Dec. 31, 2018 USD ($)	[1]
Leases Operating [Abstract]
2019	$ 55,860
2020	56,500
2021	57,194
2022	58,117
2023	59,084
Thereafter	526,114
Total	$ 812,869

[1] Includes cash rental payments due to the Company under the 15-year triple-net master lease with certain affiliates of Creative Solutions for the Texas Ten Portfolio, which commenced on January 1, 2019 and provides initial annual base rent of approximately $7.7 million. Additionally, the table includes cash rental payments under a 10-year lease agreement for approximately 29.1% of the Company’s one medical office building with commenced on January 1, 2019 and provides for initial annual base rent of approximately $0.4 million.