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Stockholders' Equity (Details) (USD $)
3 Months Ended
Jun. 30, 2012
Mar. 31, 2012
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2011
Jun. 30, 2012
ATM Sales Program
May 06, 2010
ATM Sales Program
Equity Offerings              
Common stock, shares outstanding 82,937,405       82,937,405    
Maximum aggregate gross sales price of common stock             $ 75,000,000
Common stock available to be sold under the plan           34,300,000  
Dividends declared and paid              
Dividends Per Share $ 0.19 $ 0.19 $ 0.19 $ 0.19      
Total Dividends $ 15,758,000 $ 15,758,000 $ 15,473,000 $ 15,473,000