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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, 2020 | Jun. 30, 2019
Business Acquisition [Line Items] |  |
Total purchase price | $ 71,965 | $ 46,563
Land value subject to land lease agreement | 2,711 |
Loan receivable | 53 |
Prepaid rent | 62 |
Customer relationships |  |
Business Acquisition [Line Items] |  |
Assets acquired | 2,223 | 1,491
Above market leases |  |
Business Acquisition [Line Items] |  |
Assets acquired | 210 | 1,865
Below market leases |  |
Business Acquisition [Line Items] |  |
Liabilities assumed | (1,752) | (1,533)
Land |  |
Business Acquisition [Line Items] |  |
Assets acquired | 7,296 | 3,053
Building and improvements |  |
Business Acquisition [Line Items] |  |
Assets acquired | 54,000 | 34,670
Tenant Improvements |  |
Business Acquisition [Line Items] |  |
Assets acquired | 1,285 | 858
In-place leases |  |
Business Acquisition [Line Items] |  |
Assets acquired | 4,442 | 3,177
Leasing costs |  |
Business Acquisition [Line Items] |  |
Assets acquired | $ 4,261 | $ 2,982

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