Real Estate Investments, Net - Future Minimum Rental Revenues (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Future Minimum Rental Revenues
2019 (six months)	$ 86,806
2020	173,965
2021	174,423
2022	174,899
2023	175,232
2024	175,492
Thereafter	1,132,935
Total	$ 2,093,752
Future Minimum Rental Revenues at Prior Year End
2019		$ 146,010
2020		146,560
2021		147,132
2022		147,719
2023		148,169
Thereafter		1,055,012
Total		$ 1,790,602