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Acquisitions, Dispositions, Impairment, and Discontinued Operations (Narrative) (Details)														1 Months Ended	3 Months Ended	12 Months Ended
	Nov. 24, 2020 USD ($) a	Mar. 09, 2020 USD ($)	Mar. 03, 2020 USD ($) a	Jan. 13, 2020 USD ($) a	Dec. 19, 2019 USD ($) a	Dec. 05, 2019 USD ($)	May 29, 2019 USD ($) a	May 01, 2019 USD ($)	Apr. 01, 2019 USD ($) a	Sep. 24, 2018 USD ($) a	Apr. 12, 2018 USD ($) a	Feb. 15, 2018 USD ($)	Jan. 11, 2018 USD ($)	Feb. 28, 2019 USD ($)	Jun. 30, 2020 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 12, 2019
Property, Plant and Equipment [Line Items]
Number of Operating properties Acquired																	4
Gain on sale of operating properties, including land		$ 400,000														$ 382,000	$ 49,901,000	$ 0
Payments to Acquire Real Estate																0	$ 436,305,000	$ 290,005,000
Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member]
Property, Plant and Equipment [Line Items]
Area of Land | a			4.7							14.1
Proceeds from Sale of Land Held-for-investment			$ 800,000							$ 11,500,000
Number of Real Estate Properties																	2		3
Camden Carolinian [Member]
Property, Plant and Equipment [Line Items]
Number of Operating properties Acquired						1
Number of Units in Real Estate Property						186
Payments to Acquire Real Estate						$ 75,100,000
Camden Highland Village [Member]
Property, Plant and Equipment [Line Items]
Number of Operating properties Acquired					1
Number of Units in Real Estate Property					552
Payments to Acquire Real Estate					$ 147,200,000
Camden Rainey Street [Member]
Property, Plant and Equipment [Line Items]
Number of Operating properties Acquired								1
Number of Units in Real Estate Property								326
Payments to Acquire Real Estate								$ 120,400,000
Camden Old Town Scottsdale [Member]
Property, Plant and Equipment [Line Items]
Number of Operating properties Acquired														1
Number of Units in Real Estate Property														316
Payments to Acquire Real Estate														$ 97,100,000
Camden North Quarter [Member]
Property, Plant and Equipment [Line Items]
Number of Operating properties Acquired												1
Number of Units in Real Estate Property												333
Payments to Acquire Real Estate												$ 81,400,000
Camden Thornton Park [Member]
Property, Plant and Equipment [Line Items]
Number of Operating properties Acquired										1
Number of Units in Real Estate Property										299
Payments to Acquire Real Estate										$ 89,800,000
Camden Pier District [Member]
Property, Plant and Equipment [Line Items]
Number of Operating properties Acquired													1
Number of Units in Real Estate Property													358
Payments to Acquire Real Estate													$ 126,900,000
Camden South Bay [Member] | Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member]
Property, Plant and Equipment [Line Items]
Gain on sale of operating properties, including land																$ 6,200,000
Number of Real Estate Properties																			1
Number of Units in Real Estate Property																			270
Proceeds from Sale of Property, Plant, and Equipment															$ 38,500,000
Camden Highland Village Land [Member]
Property, Plant and Equipment [Line Items]
Area of Land | a					2.3
Purchase price of land acquired					$ 8,000,000.0
Number of Units in Real Estate Property					300
Camden Hayden II [Member]
Property, Plant and Equipment [Line Items]
Area of Land | a							11.6
Purchase price of land acquired							$ 18,000,000.0
Number of Units in Real Estate Property							397
Camden NoDa [Member]
Property, Plant and Equipment [Line Items]
Area of Land | a									4.3
Purchase price of land acquired									$ 10,900,000
Number of Units in Real Estate Property									387
Camden Lake Eola [Member]
Property, Plant and Equipment [Line Items]
Area of Land | a											1.8
Purchase price of land acquired											$ 11,400,000
Number of Units in Real Estate Property											360
CamdenCopperRidge1 [Member] | Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member]
Property, Plant and Equipment [Line Items]
Number of Units in Real Estate Property																			632
Proceeds from Sale of Property, Plant, and Equipment																	$ 69,400,000
Cameron Village [Member]
Property, Plant and Equipment [Line Items]
Area of Land | a				4.9
Purchase price of land acquired				$ 18,200,000
Number of Units in Real Estate Property				355
Camden Durham
Property, Plant and Equipment [Line Items]
Area of Land | a	4.1
Purchase price of land acquired	$ 27,600,000
Number of Units in Real Estate Property	354

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