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Common Stock Cash Dividend (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
0 Months Ended 9 Months Ended 12 Months Ended
Sep. 11, 2012
Sep. 30, 2012
Dec. 31, 2011
Common Stock Cash Dividend      
Cash dividend (in dollars per share) $ 0.33    
Cash dividend $ 4,931 $ 14,672 $ 19,088