Quarterly report pursuant to Section 13 or 15(d)

Acquisition of Rental Property Pro Forma Financial Information (Details)

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Acquisition of Rental Property Pro Forma Financial Information (Details) (Deer Park [Member], USD $)
In Thousands, except Per Share data, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Deer Park [Member]
       
Business Acquisition [Line Items]        
Total Revenue $ 104,326 $ 98,905 $ 300,931 $ 286,452
Income from continuing operations 29,417 15,041 61,700 60,333
Business Acquisition, Pro Forma Net Income (Loss) $ 27,861 $ 14,257 $ 58,466 $ 58,102
Business Acquisition, Pro Forma Earnings Per Share, Basic $ 0.30 $ 0.15 $ 0.62 $ 0.63
Business Acquisition, Pro Forma Earnings Per Share, Diluted $ 0.29 $ 0.15 $ 0.61 $ 0.62