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Stockholders' Equity - Dividends (Details) - $ / shares
3 Months Ended 9 Months Ended
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Mar. 31, 2019
Mar. 31, 2018
Equity [Abstract]                
Cash dividend (in dollars per share) $ 0.1 $ 0.1 $ 0.1 $ 0.1 $ 0.075 $ 0.075 $ 0.10 $ 0.083