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Common Stock Cash Dividend (Details) - USD ($)
9 Months Ended
Sep. 10, 2015
Sep. 30, 2015
Sep. 30, 2014
Common Stock Cash Dividend      
Quarterly cash distributions declared per share of common stock (in dollars per share) $ 0.39    
Quarterly cash dividend declared $ 6,476,000 $ 19,277,000 $ 17,796,000