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Real Estate and Intangible Assets - Business Combinations and Asset Acquisitions (Details) - USD ($) $ in Thousands | 6 Months Ended
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Jun. 30, 2019 | Jun. 30, 2018
Business Acquisition [Line Items] |  |
Total Purchase Price | $ 46,557 | $ 14,341
Customer relationships |  |
Business Acquisition [Line Items] |  |
Assets Acquired | 1,491 | 566
Above market leases |  |
Business Acquisition [Line Items] |  |
Assets Acquired | 1,865 | 49
Below Market Leases |  |
Business Acquisition [Line Items] |  |
Liabilities Assumed | (1,533) | 0
Land |  |
Business Acquisition [Line Items] |  |
Assets Acquired | 3,047 | 459
Building |  |
Business Acquisition [Line Items] |  |
Assets Acquired | 34,670 | 11,609
Tenant Improvements |  |
Business Acquisition [Line Items] |  |
Assets Acquired | 858 | 615
In-place leases |  |
Business Acquisition [Line Items] |  |
Assets Acquired | 3,177 | 509
Leasing costs |  |
Business Acquisition [Line Items] |  |
Assets Acquired | $ 2,982 | $ 534

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