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Significant Acquisitions (Details) (USD $) Share data in Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2011 sqft property	Dec. 31, 2010
Significant Acquisitions
Number of properties acquired	5
Rental area of properties acquired (in square feet)	994,000
Aggregate purchase price of properties acquired, excluding closing costs and adjustments	$ 214,000,000
Selling, general and administrative expenses related to the acquisitions	620,000
Estimated fair value of assets acquired at the date of acquisition
Real estate assets	151,897,000
Value of acquired real estate leases	66,034,000
Acquired unfavorable leases	(3,804,000)
Total	214,127,000
Pro forma operating results for the company and acquisitions
Revenue	148,735,000	140,796,000
Income from continuing operations	18,225,000	16,233,000
Net income	43,769,000	21,601,000
Weighted average shares outstanding (in shares)	81,857	79,826
Income from continuing operations per share (in dollars per share)	$ 0.22	$ 0.20
Net income per share (in dollars per share)	$ 0.53	$ 0.27
Revenue recognized due to the acquisitions	17,300,000
Net income from operations recognized due to the acquisitions	$ 3,600,000
Illinois
Significant Acquisitions
Number of properties acquired	1
North Carolina
Significant Acquisitions
Number of properties acquired	1
Texas
Significant Acquisitions
Number of properties acquired	3

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- Definition

The amount of acquisition cost of a business combination allocated to real estate assets acquired.

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The amount of acquisition cost of a business combination allocated to real estate leases acquired.

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The amount of acquisition cost of a business combination allocated to unfavorable leases acquired.

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Represents the number of properties acquired by the entity during the period.

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Represents the aggregate purchase price excluding closing costs and adjustments of real estate properties acquired by the entity during the period.

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The pro forma basic net income per share for a period as if the business combination or combinations had been completed at the beginning of a period.

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The pro forma income from continuing operations before changes in accounting and extraordinary items, net of tax effect per basic share of common stock for a period as if the business combination or combinations had been completed at the beginning of a period.

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The pro forma net Income or Loss for the period as if the business combination or combinations had been completed at the beginning of a period.

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This element represents the amount of earnings or loss of the acquiree since the acquisition date included in the consolidated income statement for the reporting period.

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This element represents the amount of revenue of the acquiree since the acquisition date included in the consolidated income statement for the reporting period.

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The weighted average number of shares (units) outstanding in the calculation of pro forma basic earnings per share (earnings per unit), which is commonly presented in initial public offerings based on the terms of the offering.

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