Investments - Schedule of Net Aggregate Amortization Expense of Intangible Assets and Liabilities (Details) $ in Thousands |
Dec. 31, 2018
USD ($)
|
|---|---|
| Real Estate [Abstract] | |
| 2019 | $ 22,538 |
| 2020 | 21,650 |
| 2021 | 20,034 |
| 2022 | 17,658 |
| 2023 | 16,472 |
| Thereafter | 75,949 |
| Total future minimum amortization | $ 174,301 |