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Condensed Consolidated Statements of Stockholders' Equity (Deficit) (Parenthetical) - $ / shares
shares in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Statement of Stockholders' Equity [Abstract]    
Dividends declared per common share (in dollars per share) $ 0.45 $ 0.40
Purchase of shares of common stock under share repurchase program (in shares) 872,317 407,091