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Investment in Real Estate - Summary of Acquisition Purchase Price Allocation (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Real Estate [Line Items] |  |  |
Land | $ 864,813 | $ 794,821 |
Buildings and Improvements | 2,521,457 | 2,523,015 |
Acquisition Activity |  |  |
Real Estate [Line Items] |  |  |
Land | 92,810 | 70,380 |
Buildings and Improvements | 73,028 | 37,031 |
Other Assets | 1,659 | 781 |
Assumed Mortgage Loan Premium (See Note 4) | 0 | (529) |
Purchase price of industrial properties acquired | 174,209 | 111,130 | $ 169,218
Assumed Mortgage Loan (See Note 4) | 0 | (4,513) |
Purchase Price, Net | 174,209 | 106,617 |
Acquisition Activity | In-Place Leases |  |  |
Real Estate [Line Items] |  |  |
Acquired finite lived intangible assets, fair value | (7,905) | (3,253) |
Acquisition Activity | Above Market Leases |  |  |
Real Estate [Line Items] |  |  |
Acquired finite lived intangible assets, fair value | (227) | (214) |
Acquisition Activity | Below Market Leases |  |  |
Real Estate [Line Items] |  |  |
Acquired Finite-lived Intangible Liabilities, Fair Value | $ 1,420 | $ 0 |

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