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Revenue Recognition - Disaggregation of Lease Income (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Disaggregation of Revenue [Line Items]
Minimum lease payments	$ 39,059	$ 43,590	$ 78,466	$ 88,183
Lease income, net	55,509	60,034	110,544	122,373
Estimated credit losses	(420)	(284)	(1,089)	(366)
Billed and unbilled tax and insurance recoveries
Disaggregation of Revenue [Line Items]
Lease income, net	8,717	9,286	16,975	18,175
Billed and unbilled common area maintenance and other recoveries
Disaggregation of Revenue [Line Items]
Lease income, net	5,348	5,783	11,125	12,602
Amortization of above and below-market leases and lease inducements, net
Disaggregation of Revenue [Line Items]
Lease income, net	1,327	1,246	2,918	2,748
Short-term, termination fee, and other lease income
Disaggregation of Revenue [Line Items]
Lease income, net	$ 1,478	$ 413	$ 2,149	$ 1,031

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+ References

No definition available.

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- Definition

Amount of lease income from operating, direct financing, and sales-type leases. Includes, but is not limited to, variable lease payments, interest income, profit (loss) recognized at commencement, and lease payments paid and payable to lessor.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 30
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=119202524&loc=SL77919372-209981

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- Definition

Amount of operating lease income from lease payments paid and payable to lessor. Excludes variable lease payments not included in measurement of lease receivable.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 270
-SubTopic 10
-Section 50
-Paragraph 6A
-URI http://asc.fasb.org/extlink&oid=118952077&loc=SL77927221-108306

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 30
-Section 50
-Paragraph 5
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=119202524&loc=SL77919372-209981

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Amount of expense related to estimated loss to be realized from lease transactions.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 220
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-04.11)
-URI http://asc.fasb.org/extlink&oid=116637391&loc=SL114874048-224260

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