Quarterly report pursuant to Section 13 or 15(d)

Property Portfolio (Schedule of Recognized Identified Assets Acquired and Liabilities Assumed) (Details)

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Property Portfolio (Schedule of Recognized Identified Assets Acquired and Liabilities Assumed) (Details)
$ in Thousands
Sep. 30, 2018
USD ($)
Business Acquisition [Line Items]  
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Less Noncontrolling Interest $ 64,051
Land And Site Improvements [Member]  
Business Acquisition [Line Items]  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment 3,997
Leasing costs [Member]  
Business Acquisition [Line Items]  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Financial Assets 1,979
Moline / Silvis Facility [Member]  
Business Acquisition [Line Items]  
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Less Noncontrolling Interest 6,871
Moline / Silvis Facility [Member] | Building And Tenant Improvements [Member]  
Business Acquisition [Line Items]  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment 5,862
Moline / Silvis Facility [Member] | In Place Leases [Member]  
Business Acquisition [Line Items]  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment 343
Moline / Silvis Facility [Member] | Above Market Lease Intangibles [Member]  
Business Acquisition [Line Items]  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment 219
Moline / Silvis Facility [Member] | Leasing costs [Member]  
Business Acquisition [Line Items]  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Financial Assets 427
Moline / Silvis Facility [Member] | Below Market Lease Intangible [Member]  
Business Acquisition [Line Items]  
Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed, Below Market Lease Intangibles (229)
Moline / Silvis Facility [Member] | Site Improvements [Member]  
Business Acquisition [Line Items]  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment 249
Orlando Facility [Member]  
Business Acquisition [Line Items]  
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Less Noncontrolling Interest 16,404
Orlando Facility [Member] | Land And Site Improvements [Member]  
Business Acquisition [Line Items]  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment 3,075
Orlando Facility [Member] | Building And Tenant Improvements [Member]  
Business Acquisition [Line Items]  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment 11,944
Orlando Facility [Member] | In Place Leases [Member]  
Business Acquisition [Line Items]  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment 808
Orlando Facility [Member] | Above Market Lease Intangibles [Member]  
Business Acquisition [Line Items]  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment 229
Orlando Facility [Member] | Leasing costs [Member]  
Business Acquisition [Line Items]  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Financial Assets 358
Orlando Facility [Member] | Below Market Lease Intangible [Member]  
Business Acquisition [Line Items]  
Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed, Below Market Lease Intangibles (10)
Belpre Portfolio [Member] | Building And Tenant Improvements [Member]  
Business Acquisition [Line Items]  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment 53,520
Belpre Portfolio [Member] | In Place Leases [Member]  
Business Acquisition [Line Items]  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment 2,660
Belpre Portfolio [Member] | Above Market Lease Intangibles [Member]  
Business Acquisition [Line Items]  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment 2,527
Belpre Portfolio [Member] | Below Market Lease Intangible [Member]  
Business Acquisition [Line Items]  
Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed, Below Market Lease Intangibles (632)
Derby Facility [Member]  
Business Acquisition [Line Items]  
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Less Noncontrolling Interest 3,581
Derby Facility [Member] | Land And Site Improvements [Member]  
Business Acquisition [Line Items]  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment 566
Derby Facility [Member] | Building And Tenant Improvements [Member]  
Business Acquisition [Line Items]  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment 2,585
Derby Facility [Member] | In Place Leases [Member]  
Business Acquisition [Line Items]  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment 299
Derby Facility [Member] | Above Market Lease Intangibles [Member]  
Business Acquisition [Line Items]  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment
Derby Facility [Member] | Leasing costs [Member]  
Business Acquisition [Line Items]  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Financial Assets 154
Derby Facility [Member] | Below Market Lease Intangible [Member]  
Business Acquisition [Line Items]  
Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed, Below Market Lease Intangibles $ (23)