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Condensed Consolidated Statements of Stockholders' (Deficit) Equity (Parenthetical) - $ / shares
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Statement of Stockholders' Equity [Abstract]        
Dividends declared (in dollars per share) $ 1.14 $ 1.04 $ 2.21 $ 2.08