Investments - Schedule of Minimum Future Contractual Rent to be Received from Direct Financing Leases (Details) $ in Thousands |
Jun. 30, 2019
USD ($)
|
|---|---|
| Real Estate [Abstract] | |
| Remainder of 2019 | $ 599 |
| 2020 | 578 |
| 2021 | 527 |
| 2022 | 541 |
| 2023 | 554 |
| Thereafter | 1,929 |
| Total future minimum rentals | $ 4,728 |