Real Estate Investments, Net - Future Minimum Rental Revenues (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Future Minimum Rental Revenues
2019 (three months)	$ 42,132
2020	169,209
2021	170,221
2022	170,587
2023	170,807
2024	170,952
Thereafter	1,111,769
Total	$ 2,005,677
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