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Consolidated Statement of Stockholders' Equity (Parenthetical) - $ / shares
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Consolidated statement of stockholders' equity [Abstract]        
Common Stock, Dividends, Per Share, Declared $ 0.30 $ 0.27 $ 0.30 $ 0.27