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Real Estate and Intangible Assets - Business Combinations and Asset Acquisitions (Details) - USD ($) $ in Thousands | 9 Months Ended
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Sep. 30, 2018 | Sep. 30, 2017
Business Acquisition [Line Items] |  |
Discount on Assumed Debt | $ 0 | $ 399
Total Purchase Price | 22,800 | 94,421
Customer relationships |  |
Business Acquisition [Line Items] |  |
Assets Acquired | 792 | 6,851
Above market leases |  |
Business Acquisition [Line Items] |  |
Assets Acquired | 49 | 1,916
Below market leases |  |
Business Acquisition [Line Items] |  |
Fair Value of Interest Rate Swap Assumed | (300) | (1,769)
Land |  |
Business Acquisition [Line Items] |  |
Assets Acquired | 1,140 | 15,137
Building |  |
Business Acquisition [Line Items] |  |
Assets Acquired | 17,849 | 51,186
Tenant improvements |  |
Business Acquisition [Line Items] |  |
Assets Acquired | 776 | 6,060
In-place leases |  |
Business Acquisition [Line Items] |  |
Assets Acquired | 1,249 | 9,516
Leasing costs |  |
Business Acquisition [Line Items] |  |
Assets Acquired | $ 1,245 | $ 5,083

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