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Investment in Unconsolidated Joint Ventures (Details) (USD $)	3 Months Ended		6 Months Ended		12 Months Ended	16 Months Ended	0 Months Ended	1 Months Ended		6 Months Ended	1 Months Ended
	Jun. 30, 2013 property	Jun. 30, 2012	Jun. 30, 2013 item property	Jun. 30, 2012	Dec. 31, 2012 item property	May 31, 2013	Apr. 16, 2013 Unconsolidated JV in Plano, Texas	Feb. 28, 2013 Unconsolidated JV in Plano, Texas	Feb. 29, 2012 Unconsolidated JV in Plano, Texas acre	Jun. 30, 2012 Unconsolidated JV in Plano, Texas	May 31, 2013 Unconsolidated JV in Los Angeles, California
Investment in Unconsolidated Joint Ventures
Number of unconsolidated joint ventures			5		7
Number of properties owned and operated by each unconsolidated joint venture	1		1		1
Investment in unconsolidated joint ventures	$ 5,085,000		$ 5,085,000		$ 19,485,000
Gain on sale of properties						4,705,000
Equity in earnings of unconsolidated joint ventures	57,000	534,000	391,000	748,000
Investment in Unconsolidated Joint Ventures
Area of site (in acres)									6.2
Ownership percentage in variable interest entity								90.00%	90.00%
Ownership percentage in variable interest entity of other party									10.00%
Amount contributed by other party									1,500,000
Gain from contribution of property to joint venture				319,000						319,000
Gain on disposition of real estate - unconsolidated joint venture	2,807,000		2,807,000								2,807,000
Proceeds before cost of sale from disposition of unconsolidated joint venture interest								13,500,000
Net proceeds from disposition of unconsolidated joint venture property											4,630,000
Gain on sale of equity interest in the joint venture							1,898,000
Sale price of real estate sold in unconsolidated joint venture											25,000,000
Mortgage prepayment penalty											$ 148,000

X

- Definition

Represents the pro rata share of the amount of gain or loss resulting from sale of property by unconsolidated joint venture.

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- Definition

Portion of equity (net assets) in a variable interest entity (VIE) not attributable, directly or indirectly, to the parent entity. That is, this is the portion of equity in a VIE that is attributable to the other joint venture partner.

+ References

No definition available.

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- Definition

Represents the amount of mortgage prepayment penalty.

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- Definition

Represents the number of properties owned and operated by each unconsolidated joint venture.

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Represents the number of unconsolidated joint ventures of the entity.

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- Definition

Represents proceeds before cost of sale from disposition of unconsolidated joint venture interest

+ References

No definition available.

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- Definition

The cash inflow from the sale of real estate in an unconsolidated joint venture that the reporting entity has not previously accounted for using consolidation or the equity method of accounting.

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No definition available.

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- Definition

Sale price of real estate sold in unconsolidated joint venture.

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No definition available.

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- Definition

Percentage of the Variable Interest Entity's (VIE) voting interest owned by (or beneficial interest in) the joint venture partner.

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- Definition

Area of a real estate property.

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X

- Definition

The net realized gain (loss) on investments sold during the period, not including gains (losses) on securities separately or otherwise categorized as trading, available-for-sale, or held-to-maturity, which, for cash flow reporting, is a component of proceeds from investing activities.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 95

-Paragraph 28

-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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-Section 45

-Paragraph 28

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- Definition

The difference between the carrying value and the sale price of real estate or properties that were intended to be sold or held for capital appreciation or rental income. This element refers to the gain (loss) included in earnings and not to the cash proceeds of the sale. This element is a noncash adjustment to net income when calculating net cash generated by operating activities using the indirect method.

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-Name Accounting Standards Codification

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-SubTopic 10

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- Definition

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

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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))

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-Chapter V

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This item represents the entity's proportionate share for the period of the net income (loss) of its investee (such as unconsolidated subsidiaries and joint ventures) to which the equity method of accounting is applied. This item includes income or expense related to stock-based compensation based on the investor's grant of stock to employees of an equity method investee.

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 95

-Paragraph 28

-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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-Paragraph 6

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-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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-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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-Publisher FASB

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The carrying amount of investments in unconsolidated real estate and other joint ventures not separately presented. This includes direct and indirect investments.

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-Publisher FASB

-Name Accounting Standards Codification

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-Subparagraph (SX 210.7-03.1(d))

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Percentage of the Variable Interest Entity's (VIE) voting interest owned by (or beneficial interest in) the reporting entity (directly or indirectly).

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-Publisher FASB

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