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Stockholders' Equity - Cash Dividends Declared - Common Stock (Details) - $ / shares
3 Months Ended
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Stockholders' Equity Note [Abstract]            
Cash dividend per share (in dollars per share) $ 0.2 $ 0.2 $ 0.2 $ 0.2 $ 0.2 $ 0.20