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Stockholders' Equity - Reconciliation of Stockholders' Equity to Noncontrolling Interests (Parenthetical) (Details) - $ / shares
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Equity [Abstract]        
Dividends declared per common share $ 0.10 $ 0.10 $ 0.30 $ 0.30