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Stockholders' Equity - Reconciliation of Denominators used in Computation of Basic and Diluted Earnings Per Share (Details) - shares
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Stockholders' Equity Note [Abstract]        
Basic weighted average shares outstanding (in shares) 287,456,943 288,995,492 288,451,470 288,907,934
Weighted shares assumed upon exercise of stock options (in shares) 121,100 154,114 140,104 227,908
Diluted weighted average shares outstanding (in shares) 287,578,043 289,149,606 288,591,574 289,135,842