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Acquisitions (Narrative) (Details) $ in Thousands						6 Months Ended
	Apr. 12, 2018 USD ($) a	Feb. 15, 2018 USD ($)	Jan. 11, 2018 USD ($)	Jun. 01, 2017	Apr. 28, 2017 USD ($) a	Jun. 30, 2018 USD ($)	Jun. 30, 2017 USD ($)
Number of Operating properties Acquired						2
Area of Land | a	1.8				8.2
Payments to Acquire Land	$ 11,400				$ 20,000
Number of Units in Real Estate Property	360
Purchase Price of Operating Properties Acquired						$ 201,899	$ 58,267
Camden Pier District [Member]
Number of Operating properties Acquired			1
Number of Units in Real Estate Property			358
Purchase Price of Operating Properties Acquired			$ 126,900
Camden North Quarter [Member]
Number of Operating properties Acquired		1
Number of Units in Real Estate Property		333
Purchase Price of Operating Properties Acquired		$ 81,400
Camden Buckhead Square [Member]
Number of Operating properties Acquired				1
Number of Units in Real Estate Property				250

X

- Definition

Number of operating properties acquired which are now fully consolidated during the period.

+ References

No definition available.

+ Details

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- Definition

Area of land held.

+ References

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+ Details

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X

- Definition

The number of units in a real estate property owned as of the balance sheet date.

+ References

No definition available.

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X

- Definition

The cash outflow from the acquisition of real estate intended to generate income for the owner; excludes land acquired for use by the owner.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 13
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3213-108585

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- Definition

The cash outflow from the acquisition of a piece of land, anything permanently fixed to it, including buildings, structures on it and so forth; includes real estate intended to generate income for the owner; excludes real estate acquired for use by the owner.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 13
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3213-108585

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