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Held For Sale/Disposed Assets (Narrative) (Details) $ in Millions	6 Months Ended
	Jun. 30, 2018 USD ($) property	Jun. 30, 2017 USD ($) property
Held For Sale Assets [Line Items]
Number of properties | property	195
Discontinued Operations, Held-for-sale [Member]
Held For Sale Assets [Line Items]
Number of properties | property	0
Los Angeles [Member] | Discontinued Operations, Disposed of by Sale [Member]
Held For Sale Assets [Line Items]
Number of properties sold | property		1
Proceeds from sale of property		$ 25.3
Gain on sale of property		$ 10.1
Washington D.C. [Member] | Discontinued Operations, Disposed of by Sale [Member]
Held For Sale Assets [Line Items]
Number of properties sold | property	1
Proceeds from sale of property	$ 20.3
Gain on sale of property	$ 3.3
Miami [Member] | Discontinued Operations, Disposed of by Sale [Member]
Held For Sale Assets [Line Items]
Number of properties sold | property	1
Proceeds from sale of property	$ 24.3
Gain on sale of property	$ 11.7

X

- Definition

Held For Sale Assets [Line Items]

+ References

No definition available.

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- Definition

Number Of Real Estate Properties Sold

+ References

No definition available.

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X

- Definition

The net gain (loss) resulting from sales and other disposals of real estate owned for investment purposes.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 225
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-04.14(d))
-URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882

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- Definition

The number of real estate properties owned as of the balance sheet date.

+ References

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- Definition

Cash received for the sale of real estate that is not part of an investing activity during the current period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 12
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3179-108585

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