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Real Estate and Intangible Assets - Summary of Acquired Properties (Details) $ in Thousands |  |  |  |  |  |  |  |  | 6 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Mar. 09, 2020 USD ($) ft² | Jan. 27, 2020 USD ($) ft² property | Jan. 08, 2020 USD ($) ft² tenant | Jun. 18, 2019 USD ($) ft² | Apr. 30, 2019 USD ($) ft² | Apr. 05, 2019 USD ($) ft² | Feb. 28, 2019 USD ($) ft² | Feb. 08, 2019 USD ($) ft² | Jun. 30, 2020 USD ($) ft² property | Jun. 30, 2019 USD ($) ft² property
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Number of properties acquired | property |  |  |  |  |  |  |  |  | 5 | 6
Aggregate Purchase Price |  |  |  |  |  |  |  |  | $ 71,965 | $ 46,563
Indianapolis, Indiana |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Aggregate Square Footage | ft² |  |  | 64,800 |  |  |  | 34,800 |  |  |
Weighted Average Lease Term |  |  | 7 years 2 months 12 days |  |  |  | 10 years |  |  |
Aggregate Purchase Price |  |  | $ 5,300 |  |  |  | $ 3,600 |  |  |
Aggregate Annualized GAAP Fixed Lease Payments |  |  | $ 500 |  |  |  | $ 300 |  |  |
Number of tenants | tenant |  |  | 3 |  |  |  |  |  |  |
Houston, Texas; Charlotte, North Carolina; St. Charles, Missouri |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Aggregate Square Footage | ft² |  | 320,838 |  |  |  |  |  |  |  |
Weighted Average Lease Term |  | 20 years |  |  |  |  |  |  |  |
Aggregate Purchase Price |  | $ 34,700 |  |  |  |  |  |  |  |
Aggregate Annualized GAAP Fixed Lease Payments |  | $ 2,600 |  |  |  |  |  |  |  |
Number of properties in portfolio | property |  | 3 |  |  |  |  |  |  |  |
Chatsworth, Georgia |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Aggregate Square Footage | ft² | 504,400 |  |  |  |  |  |  |  |  |
Weighted Average Lease Term | 10 years 6 months |  |  |  |  |  |  |  |  |
Aggregate Purchase Price | $ 32,000 |  |  |  |  |  |  |  |  |
Aggregate Annualized GAAP Fixed Lease Payments | 2,200 |  |  |  |  |  |  |  |  |
Philadelphia, Pennsylvania |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Aggregate Square Footage | ft² |  |  |  |  |  |  |  | 26,050 |  |
Weighted Average Lease Term |  |  |  |  |  |  |  | 15 years 1 month 6 days |  |
Aggregate Purchase Price |  |  |  |  |  |  |  | $ 2,700 |  |
Aggregate Annualized GAAP Fixed Lease Payments |  |  |  |  |  |  |  | $ 200 |  |
Ocala, Florida |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Aggregate Square Footage | ft² |  |  |  |  |  | 207,000 |  |  |  |
Weighted Average Lease Term |  |  |  |  |  | 20 years 1 month 6 days |  |  |  |
Aggregate Purchase Price |  |  |  |  |  | $ 11,900 |  |  |  |
Aggregate Annualized GAAP Fixed Lease Payments |  |  |  |  |  | $ 800 |  |  |  |
Ocala, Florida |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Aggregate Square Footage | ft² |  |  |  |  |  | 176,000 |  |  |  |
Weighted Average Lease Term |  |  |  |  |  | 20 years 1 month 6 days |  |  |  |
Aggregate Purchase Price |  |  |  |  |  | $ 7,300 |  |  |  |
Aggregate Annualized GAAP Fixed Lease Payments |  |  |  |  |  | $ 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 Fixed Lease Payments |  |  |  |  | $ 200 |  |  |  |  |
Tifton, Georgia |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Aggregate Square Footage | ft² |  |  |  | 676,031 |  |  |  |  |  |
Weighted Average Lease Term |  |  |  | 8 years 6 months |  |  |  |  |  |
Aggregate Purchase Price |  |  |  | $ 17,900 |  |  |  |  |  |
Aggregate Annualized GAAP Fixed Lease Payments |  |  |  | 1,600 |  |  |  |  |  |
Series of property acquisitions |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Aggregate Square Footage | ft² |  |  |  |  |  |  |  |  | 890,038 | 1,174,311
Weighted Average Lease Term |  |  |  |  |  |  |  |  | 14 years 9 months 18 days | 13 years 8 months 12 days
Aggregate Purchase Price |  |  |  |  |  |  |  |  | $ 71,965 | $ 46,563
Capitalized Acquisition Expenses |  |  |  |  |  |  |  |  | 255 | 452
Aggregate Annualized GAAP Fixed Lease Payments |  |  |  |  |  |  |  |  | 5,303 | 3,819
Aggregate Debt Issued or Assumed |  |  |  |  |  |  |  |  | 35,855 | $ 8,900
New fixed rate mortgage notes payable |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Debt assumed |  |  |  |  |  |  |  |  | 35,855 |
New fixed rate mortgage notes payable | Houston, Texas; Charlotte, North Carolina; St. Charles, Missouri |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Debt assumed |  |  |  |  |  |  |  |  | $ 18,300 |
Stated interest rate (as percent) |  |  |  |  |  |  |  |  | 3.625% |
New fixed rate mortgage notes payable | Tifton, Georgia |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Debt assumed |  |  |  | $ 8,900 |  |  |  |  |  |
Stated interest rate (as percent) |  |  |  | 4.35% |  |  |  |  |  |
Interest rate swaps | Chatsworth, Georgia |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Aggregate Debt Issued or Assumed | $ 17,500 |  |  |  |  |  |  |  |  |
Stated interest rate (as percent) | 2.80% |  |  |  |  |  |  |  |  |

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