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Acquisitions and Dispositions (Acquisitions) (Details) $ in Thousands | 1 Months Ended
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Mar. 31, 2017 store | Jan. 31, 2017 USD ($) store
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net [Abstract] |  |
Land |  | $ 49,663
Building and improvements |  | 16,779
Tenant improvements |  | 4,611
Above-market leases |  | 681
In-place leases |  | 8,943
Total assets |  | 80,677
Below-market leases |  | (878)
Net assets acquired |  | $ 79,799
Macy's |  |
Business Acquisition [Line Items] |  |
Number of stores closed (store) | store | 3 |
Sears Department Stores |  |
Business Acquisition [Line Items] |  |
Number of stores acquired (store) | store |  | 5
Minimum period of lease before termination |  | 2 years
Sears Auto Centers |  |
Business Acquisition [Line Items] |  |
Number of stores acquired (store) | store |  | 2
Minimum period of lease before termination |  | 1 year
Sears Department Stores and Auto Centers |  |
Business Acquisition [Line Items] |  |
Consideration paid |  | $ 72,765
Transaction costs |  | $ 265
Term of lease |  | 10 years
Initial base rent |  | $ 5,075
Decrease in rent for third through tenth years of leases |  | 0.25%
Required notice period for cancellation of lease |  | 6 months
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net [Abstract] |  |
Land |  | $ 45,028
Building and improvements |  | 14,814
Tenant improvements |  | 4,234
Above-market leases |  | 681
In-place leases |  | 8,364
Total assets |  | 73,121
Below-market leases |  | (356)
Net assets acquired |  | $ 72,765
Sears Department Stores and Auto Centers | Above-market leases |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net [Abstract] |  |
Weighted average amortization period |  | 2 years
Sears Department Stores and Auto Centers | In-place leases |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net [Abstract] |  |
Weighted average amortization period |  | 2 years 2 months
Sears Department Stores and Auto Centers | Below-market leases |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net [Abstract] |  |
Weighted average amortization period |  | 5 years 4 months 20 days
Jefferson Mall |  |
Business Acquisition [Line Items] |  |
Minimum period of lease before termination |  | 4 years
Macy's |  |
Business Acquisition [Line Items] |  |
Number of stores acquired (store) | store |  | 4
Consideration paid |  | $ 7,034
Transaction costs |  | 34
Annual maintenance charge |  | 19
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net [Abstract] |  |
Land |  | 4,635
Building and improvements |  | 1,965
Tenant improvements |  | 377
Above-market leases |  | 0
In-place leases |  | 579
Total assets |  | 7,556
Below-market leases |  | (522)
Net assets acquired |  | $ 7,034
Macy's | In-place leases |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net [Abstract] |  |
Weighted average amortization period |  | 2 years 1 month 28 days
Macy's | Below-market leases |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net [Abstract] |  |
Weighted average amortization period |  | 2 years 1 month 28 days

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