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Investment in Unconsolidated Joint Ventures (Details) (USD $)	3 Months Ended			0 Months Ended	1 Months Ended	3 Months Ended
	Mar. 31, 2013 item property	Mar. 31, 2012	Dec. 31, 2012	Apr. 16, 2013 Unconsolidated JV in Plano, Texas	Feb. 29, 2012 Unconsolidated JV in Plano, Texas acre	Mar. 31, 2013 Unconsolidated JV in Plano, Texas
Investment in Unconsolidated Joint Ventures
Number of unconsolidated joint ventures	7
Number of properties owned and operated by each unconsolidated joint venture	1
Investment in unconsolidated joint ventures	$ 19,399,000		$ 19,485,000
Equity in earnings of unconsolidated joint ventures	334,000	214,000
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
Proceeds from sale of equity interest in the joint venture						13,500,000
Company's investment in VIE						12,283,000
Expected realized gain on sale of equity interest in the joint venture				$ 1,900,000

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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.

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

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

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Area of a real estate property.

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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.

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

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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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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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