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Real Estate and Intangible Assets - Summary of Acquired Properties (Details) $ in Thousands |  |  |  |  |  |  | 6 Months Ended | 12 Months Ended
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Jun. 18, 2019 USD ($) ft² | Apr. 30, 2019 USD ($) ft² | Apr. 05, 2019 USD ($) ft² | Feb. 28, 2019 USD ($) ft² | Feb. 08, 2019 USD ($) ft² | Mar. 09, 2018 USD ($) ft² | Jun. 30, 2019 USD ($) ft² | Jun. 30, 2018 USD ($) ft² | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Aggregate Purchase Price |  |  |  |  |  |  | $ 46,557 | $ 14,341 |  |
Series of Property Acquisitions |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Aggregate Square Footage | ft² |  |  |  |  |  |  | 1,174,311 | 127,444 |  |
Weighted Average Lease Term |  |  |  |  |  |  | 13 years 8 months 12 days | 9 years 9 months 18 days |  |
Aggregate Purchase Price |  |  |  |  |  |  | $ 46,557 | $ 14,341 |  |
Acquisition Expenses |  |  |  |  |  |  | 452 | 91 |  |
Aggregate Annualized GAAP Rent |  |  |  |  |  |  | 3,819 | $ 1,087 |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate, New Mortgage Loan |  |  |  |  |  |  |  |  | $ 8,900 | $ 0
Philadelphia, Pennsylvania |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Aggregate Square Footage | ft² |  |  |  |  | 26,050 |  |  |  |  |
Weighted Average Lease Term |  |  |  |  | 15 years 23 days |  |  |  |  |
Aggregate Purchase Price |  |  |  |  | $ 2,700 |  |  |  |  |
Aggregate Annualized GAAP Rent |  |  |  |  | $ 200 |  |  |  |  |
Indianapolis, Indiana |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Aggregate Square Footage | ft² |  |  |  | 34,800 |  |  |  |  |  |
Weighted Average Lease Term |  |  |  | 10 years 1 day |  |  |  |  |  |
Aggregate Purchase Price |  |  |  | $ 3,600 |  |  |  |  |  |
Aggregate Annualized GAAP Rent |  |  |  | $ 300 |  |  |  |  |  |
Ocala, Florida |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Aggregate Square Footage | ft² |  |  | 207,000 |  |  |  |  |  |  |
Weighted Average Lease Term |  |  | 20 years 26 days |  |  |  |  |  |  |
Aggregate Purchase Price |  |  | $ 11,900 |  |  |  |  |  |  |
Aggregate Annualized GAAP Rent |  |  | $ 800 |  |  |  |  |  |  |
Ocala, Florida |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Aggregate Square Footage | ft² |  |  | 176,000 |  |  |  |  |  |  |
Weighted Average Lease Term |  |  | 20 years 26 days |  |  |  |  |  |  |
Aggregate Purchase Price |  |  | $ 7,300 |  |  |  |  |  |  |
Aggregate Annualized GAAP Rent |  |  | $ 700 |  |  |  |  |  |  |
Columbus, Ohio |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Aggregate Square Footage | ft² |  | 54,430 |  |  |  |  |  |  |  |
Weighted Average Lease Term |  | 7 years |  |  |  |  |  |  |  |
Aggregate Purchase Price |  | $ 3,200 |  |  |  |  |  |  |  |
Aggregate Annualized GAAP Rent |  | $ 200 |  |  |  |  |  |  |  |
Tifton, Georgia |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Aggregate Square Footage | ft² | 676,031 |  |  |  |  |  |  |  |  |
Weighted Average Lease Term | 8 years 5 months 13 days |  |  |  |  |  |  |  |  |
Aggregate Purchase Price | $ 17,900 |  |  |  |  |  |  |  |  |
Aggregate Annualized GAAP Rent | $ 1,600 |  |  |  |  |  |  |  |  |
Vance, Alabama |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Aggregate Square Footage | ft² |  |  |  |  |  | 127,444 |  |  |  |
Weighted Average Lease Term |  |  |  |  |  | 9 years 9 months 18 days |  |  |  |
Aggregate Purchase Price |  |  |  |  |  | $ 14,300 |  |  |  |
Aggregate Annualized GAAP Rent |  |  |  |  |  | $ 1,100 |  |  |  |
New fixed rate mortgage notes payable |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Aggregate Fixed Rate Debt Issued or Assumed |  |  |  |  |  |  | $ 41,140 |  |  |
Stated interest rate (as percent) |  |  |  |  |  |  | 3.95% |  |  |
New fixed rate mortgage notes payable | Tifton, Georgia |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Aggregate Fixed Rate Debt Issued or Assumed |  |  |  |  |  |  | $ 8,900 |  |  |
Stated interest rate (as percent) |  |  |  |  |  |  | 4.35% |  |  |

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