Annual report pursuant to Section 13 and 15(d)

Acquisition of Rental Property, Pro Forma Information (Details)

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Acquisition of Rental Property, Pro Forma Information (Details) (USD $)
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Business Acquisiton, Pro Forma Information [Line Items]    
Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual $ 18,500,000  
Business Acquisition, Pro Forma Revenue 336,838,000 317,021,000
Business Acquisition, Pro Forma Income (Loss) from Continuing Operations before Changes in Accounting and Extraordinary Items, Net of Tax 47,687,000 35,073,000
Business Combination, Pro Forma Information, Earnings or Loss of Acquiree since Acquisition Date, Actual $ (1,500,000)