The aggregate amount of development expenses that were capitalized by the Company during the period.

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- Definition

Common Units Held By Persons Other Than The Company

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- Definition

Concentration Of Location For Communities, Percentage.

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- Definition

Operating Leases Revenues Recognized Under Straight Line Method

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Weighted Average Common Ownership Interest, Percentage.

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- Definition

Total number of shares of common stock held by shareholders. May be all or portion of the number of common shares authorized. These shares represent the ownership interest of the common shareholders. Shares outstanding equals shares issued minus shares held in treasury and other adjustments, if any.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.3-04)

-URI http://asc.fasb.org/extlink&oid=6959260&loc=d3e187085-122770

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section 50

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-Publisher AICPA

-Name Accounting Principles Board Opinion (APB)

-Number 12

-Paragraph 10

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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-Name Accounting Standards Codification

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Article 3

Reference 6: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 30

-Article 5

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Reflects the calculation as of the balance sheet date of the average interest rate weighted by the amount of debt outstanding by type or by instrument at that time.

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- Definition

The equity interest of noncontrolling shareholders, partners or other equity holders in consolidated entity.

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- Definition

The parent entity's interest in net assets of the subsidiary, expressed as a percentage.

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- Definition

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

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

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- Definition

The average useful life of long-lived, physical assets used in the normal conduct of business and not intended for resale. Examples include land, buildings, machinery and equipment, and other types of furniture and equipment including, but not limited to, office equipment, furniture and fixtures, and computer equipment and software.

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The maximum useful life of long-lived, physical assets used in the normal conduct of business and not intended for resale. Examples include land, buildings, machinery and equipment, and other types of furniture and equipment including, but not limited to, office equipment, furniture and fixtures, and computer equipment and software.

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The minimum useful life of long lived, physical assets used in the normal conduct of business and not intended for resale. Examples include land, buildings, machinery and equipment, and other types of furniture and equipment including, but not limited to, office equipment, furniture and fixtures, and computer equipment and software.

+ References

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Organization And Significant Accounting Policies (Narrative) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012 Y property	Mar. 31, 2011	Dec. 31, 2011
Real Estate Properties [Line Items]
Number of units in real estate property	21,622
Number of real estate properties	58
Common stock, shares outstanding	53,654		52,988
Noncontrolling interest, ownership percentage by parent	99.70%
Common units held by persons other than the Company	151
Noncontrolling interest, ownership percentage by noncontrolling owners	0.30%
Weighted average common ownership interest, percentage	99.70%	99.70%
Revenue recognized lease (in years)	1
Development or construction costs	$ 806	$ 470
Atlanta, Georgia [Member]
Real Estate Properties [Line Items]
Concentration of location for communities, percentage	33.40%
Dallas, Texas [Member]
Real Estate Properties [Line Items]
Concentration of location for communities, percentage	23.80%
Washington, D.C. [Member]
Real Estate Properties [Line Items]
Concentration of location for communities, percentage	13.00%
Tampa, Florida [Member]
Real Estate Properties [Line Items]
Concentration of location for communities, percentage	10.70%
Buildings And Components [Member]
Real Estate Properties [Line Items]
Estimated useful life (in years)	40
Other Building And Land Improvements [Member]
Real Estate Properties [Line Items]
Estimated useful life (in years)	20
Furniture, Fixtures And Equipment [Member]
Real Estate Properties [Line Items]
Estimated useful life, minimum (years)	5
Estimated useful life, maximum (years)	10
Held In Unconsolidated Entities [Member]
Real Estate Properties [Line Items]
Number of units in real estate property	1,471
Number of real estate properties	4
Under Construction [Member]
Real Estate Properties [Line Items]
Number of units in real estate property	1,810
Number of real estate properties	6
For-Sale Condominium Homes [Member]
Real Estate Properties [Line Items]
Number of real estate properties	2
Cost Capitalization [Member]
Real Estate Properties [Line Items]
Weighted average borrowing costs, percentage	5.60%	5.90%