Investments - Schedule of Lease Intangible Assets and Liabilities, Net of Accumulated Amortization (Details) - USD ($) $ in Thousands |
Sep. 30, 2019 |
Dec. 31, 2018 |
|---|---|---|
| Lessor, Lease, Description [Line Items] | ||
| Less: accumulated amortization | $ (160,275) | $ (149,582) |
| Intangible lease assets, net | 311,597 | 294,463 |
| Below-market leases | 164,001 | 167,527 |
| Less: accumulated amortization | (47,486) | (47,365) |
| Intangible lease liabilities, net | 116,515 | 120,162 |
| In-place leases | ||
| Lessor, Lease, Description [Line Items] | ||
| Intangible lease assets, gross | 402,902 | 381,143 |
| Above-market leases | ||
| Lessor, Lease, Description [Line Items] | ||
| Intangible lease assets, gross | $ 68,970 | $ 62,902 |