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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, 2019 | Sep. 30, 2018
Business Acquisition [Line Items] |  |
Total Purchase Price | $ 67,272 | $ 22,800
Customer relationships |  |
Business Acquisition [Line Items] |  |
Assets Acquired | 2,200 | 792
Above market leases |  |
Business Acquisition [Line Items] |  |
Assets Acquired | 1,865 | 49
Below Market Leases |  |
Business Acquisition [Line Items] |  |
Liabilities Assumed | (1,627) | (300)
Land |  |
Business Acquisition [Line Items] |  |
Assets Acquired | 5,046 | 1,140
Building |  |
Business Acquisition [Line Items] |  |
Assets Acquired | 48,898 | 17,849
Tenant Improvements |  |
Business Acquisition [Line Items] |  |
Assets Acquired | 1,541 | 776
In-place leases |  |
Business Acquisition [Line Items] |  |
Assets Acquired | 4,868 | 1,249
Leasing costs |  |
Business Acquisition [Line Items] |  |
Assets Acquired | $ 4,481 | $ 1,245

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