Real Estate Assets, Discontinued Operations and Assets Held for Sale (Aggregate Balance Sheet of Properties Held for Sale Included in Discontinued Operations) (Details) $ in Thousands	6 Months Ended
Jun. 30, 2018 USD ($) buildings	Dec. 31, 2017 USD ($)
Held for Sale Assets in Continuing and Discontinued Operations
Number of Real Estate Properties Held for Sale \| buildings	0
Total assets held-for-sale	$ 0	$ 17,550
Total liabilities held-for-sale	0	1,163
Continuing Operations [Member]
Held for Sale Assets in Continuing and Discontinued Operations
Land and Land Improvements Held-for-Sale	0	8,157
Buildings and Tenant Improvements Held-for-Sale	0	10,505
Inventory, Land Held-for-sale	0	0
Accumulated Depreciation of Assets Held-for-Sale	0	(2,553)
Lease Related Assets, Held for Sale	0	862
Other assets	0	579
Total assets held-for-sale	0	17,550
Total liabilities held-for-sale	$ 0	$ 1,163

Accumulated Depreciation of Assets Held-for-Sale

No definition available.

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- Definition

Buildings and Tenant Improvements Held-for-Sale

+ References

No definition available.

+ Details

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- Definition

Land and Land Improvements Held-for-Sale

+ References

No definition available.

+ Details

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- Definition

This element represents the following, for assets held for sale, all net of accumulated amortization: (i) the amount of value allocated by a lessor (acquirer) to lease agreements which exist at acquisition of a leased property; (ii) costs incurred by the lessor that are (a) costs to originate a lease incurred in transactions with independent third parties that result directly from and are essential to acquire that lease and would not have been incurred had that leasing transaction not occurred and (b) certain costs directly related to specified activities performed by the lessor for that lease. Those activities are: evaluating the prospective lessee's financial condition; evaluating and recording guarantees, collateral, and other security arrangements; negotiating lease terms; preparing and processing lease documents; and closing the transaction; (iii) the identifiable intangible asset established upon acquisition based on a favorable difference between the terms of an acquired lease and the current market terms for that lease at the acquisition date.

+ References

No definition available.

+ Details

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- Definition

Number of Real Estate Properties Held for Sale

+ References

No definition available.

+ Details

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- Definition

Amount classified as assets attributable to disposal group held for sale or disposed of.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (e)
-URI http://asc.fasb.org/extlink&oid=84176398&loc=d3e2941-110230

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-Publisher FASB
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- Definition

Amount classified as other assets attributable to disposal group held for sale or disposed of.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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- Definition

Carrying amount as of the balance sheet date of parcels of land held for sale, and on which the entity has no intention or no further intention to perform construction activities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.6(a))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

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Balance Type:	debit
Period Type:	instant

- Definition

Amount classified as liabilities attributable to disposal group held for sale or disposed of.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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