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Dividends (Details) (USD $)
0 Months Ended 3 Months Ended
Mar. 16, 2012
Mar. 31, 2012
Mar. 31, 2011
Dividends [Abstract]      
Dividend payable date   May 18, 2012  
Dividend record date Feb. 24, 2012 Apr. 27, 2012  
Dividend per common share to be paid $ 0.16125 $ 0.16250  
Total cash dividend paid $ 10,847,000 $ 10,847,000 $ 10,402,000
Dividend declared date   Apr. 10, 2012