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Condensed Consolidated Statements of Stockholders' Deficit (Parenthetical) - $ / shares
3 Months Ended
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Statement of Stockholders' Equity [Abstract]          
Cash dividends declared, per share $ 0.40 $ 0.35 $ 0.35 $ 0.35 $ 0.35