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Investment in Real Estate Investment in Real Estate - Summary of Purchase Price Allocation (Details) - USD ($) $ in Thousands | 9 Months Ended |
--- | --- | ---
Sep. 30, 2018 | Dec. 31, 2017
Real Estate [Line Items] |  |
Land | $ 891,520 | $ 864,813
Buildings and Improvements | 2,597,344 | $ 2,521,457
Acquisition Activity |  |
Real Estate [Line Items] |  |
Land | 54,203 |
Buildings and Improvements | 45,393 |
Other Assets | 526 |
Purchase price of industrial properties acquired | 101,941 |
Assumed Mortgage Loan (Note 4) | (11,654) |
Purchase Price, Net | 90,287 |
Acquisition Activity | In-Place Leases |  |
Real Estate [Line Items] |  |
Acquired finite lived intangible assets, fair value | (2,483) |
Acquisition Activity | Above Market Leases |  |
Real Estate [Line Items] |  |
Acquired finite lived intangible assets, fair value | (73) |
Acquisition Activity | Below Market Leases |  |
Real Estate [Line Items] |  |
Acquired finite lived intangible liabilities, fair value | $ (737) |

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