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Investments In Real Estate (Narrative) (Details) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 USD ($) a ft² property | Jun. 30, 2017 USD ($) a ft² property | Jun. 30, 2018 USD ($) a ft² property | Jun. 30, 2017 USD ($) a ft² property
Finite Lived Intangible Assets [Line Items] |  |  |  |
Number of properties | property | 195 |  | 195 |
Area of real estate property | ft² | 12,500,000 |  | 12,500,000 |
Debt, Weighted Average Interest Rate | 3.80% |  | 3.80% |
Recorded revenues | $ 37,238 | $ 32,778 | $ 74,345 | $ 64,219
2018 Acquisition [Member] |  |  |  |
Finite Lived Intangible Assets [Line Items] |  |  |  |
Total expected investment, including redevelopment costs |  |  | 96,300 |
Total aggregate initial investment |  |  | 103,700 |
Land |  |  | 74,400 |
Building And Improvements |  |  | 25,400 |
Intangible assets |  |  | 3,900 |
Intangible liabilities |  |  | 2,700 |
Recorded revenues | 800 |  | 1,100 |
Recorded net income | $ 300 |  | 400 |
Redevelopment costs |  |  | $ 28,500 |
2017 Acquisition [Member] |  |  |  |
Finite Lived Intangible Assets [Line Items] |  |  |  |
Total expected investment, including redevelopment costs |  |  |  | 155,900
Total aggregate initial investment |  | 140,800 |  |
Land |  | 102,700 |  | 112,300
Building And Improvements |  | 31,200 |  | 36,700
Intangible assets |  | 6,900 |  | 6,900
Intangible liabilities |  | 17,300 |  | 17,300
Recorded revenues |  | 1,100 |  | 1,300
Recorded net income |  | $ 500 |  | $ 600
Industrial Building [Member] | 2018 Acquisition [Member] |  |  |  |
Finite Lived Intangible Assets [Line Items] |  |  |  |
Number of properties acquired | property | 2 |  | 5 |
Area of real estate property acquired | ft² | 50,000 |  | 468,000 |
Industrial Building [Member] | 2017 Acquisition [Member] |  |  |  |
Finite Lived Intangible Assets [Line Items] |  |  |  |
Number of properties acquired | property |  | 11 |  | 13
Area of real estate property acquired | ft² |  | 807,000 |  | 898,000
Industrial Property And Land [Member] | 2018 Acquisition [Member] |  |  |  |
Finite Lived Intangible Assets [Line Items] |  |  |  |
Total aggregate initial investment | $ 15,800 |  |  |
Land | 10,800 |  |  |
Building And Improvements | 3,800 |  |  |
Intangible assets | 1,300 |  |  |
Intangible liabilities | $ 400 |  |  |
Land Improvements [Member] |  |  |  |
Finite Lived Intangible Assets [Line Items] |  |  |  |
Number of properties | property | 11 |  | 11 |
Area of real estate property | a | 51.4 |  | 51.4 |
Improved Land Parcels [Member] | 2018 Acquisition [Member] |  |  |  |
Finite Lived Intangible Assets [Line Items] |  |  |  |
Number of properties acquired | property | 1 |  | 1 |
Area of real estate property acquired | a | 3.5 |  | 3.5 |
Improved Land Parcels [Member] | 2017 Acquisition [Member] |  |  |  |
Finite Lived Intangible Assets [Line Items] |  |  |  |
Number of properties acquired | property |  | 2 |  | 2
Area of real estate property acquired | a |  | 17.8 |  | 17.8
Redevelopment Property [Member] |  |  |  |
Finite Lived Intangible Assets [Line Items] |  |  |  |
Number of properties | property | 4 |  | 4 |
Area of real estate property | ft² | 500,000 |  | 500,000 |
Redevelopment Property [Member] | Industrial Distribution Building [Member] |  |  |  |
Finite Lived Intangible Assets [Line Items] |  |  |  |
Number of properties | property | 4 |  | 4 |
Area of real estate property | ft² | 500,000 |  | 500,000 |
Total expected investment, including redevelopment costs |  |  | $ 119,200 |
Capitalized interest associated with redevelopment activities | $ 600 | $ 0 | 800 | $ 0
Redevelopment costs |  |  | $ 32,900 |
Redevelopment Property [Member] | Industrial Building [Member] | 2018 Acquisition [Member] |  |  |  |
Finite Lived Intangible Assets [Line Items] |  |  |  |
Number of properties acquired | property |  |  | 2 |
Area of real estate property acquired | ft² |  |  | 318,000 |

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