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Common Stock Cash Dividend (Details) (USD $)
0 Months Ended 9 Months Ended 12 Months Ended
Sep. 11, 2014
Sep. 30, 2014
Dec. 31, 2013
Common Stock Cash Dividend      
Quarterly cash dividend declared (in dollars per share) $ 0.37    
Quarterly cash dividend declared $ 5,976,000 $ 17,796,000 $ 21,999,000