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
Mar. 31, 2018
USD ($)
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, Property, Plant, and Equipment (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, Property, Plant, and Equipment $ (10)