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Equity (Details 1) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Dividends paid to stockholders        
Dividend declared per common share $ 0.21 $ 0.21 $ 0.63 $ 0.63
Amount Paid     $ 72,236  
2/3/2012 [Member]
        
Dividends paid to stockholders        
Declaration Date     Feb. 03, 2012  
Record Date     Mar. 02, 2012  
Date Paid     Mar. 16, 2012  
Dividend declared per common share     $ 0.21  
Amount Paid     23,983  
5/11/2012 [Member]
        
Dividends paid to stockholders        
Declaration Date     May 11, 2012  
Record Date     Jun. 04, 2012  
Date Paid     Jun. 19, 2012  
Dividend declared per common share     $ 0.21  
Amount Paid     24,123  
8/8/2012 [Member]
        
Dividends paid to stockholders        
Declaration Date     Aug. 08, 2012  
Record Date     Aug. 21, 2012  
Date Paid     Sep. 05, 2012  
Dividend declared per common share     $ 0.21  
Amount Paid     $ 24,130