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Stockholders' Equity - Reconciliation of Denominators used in Computation of Basic and Diluted Earnings Per Share (Details) - shares
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Stockholders' Equity Note [Abstract]    
Basic weighted average shares outstanding (in shares) 286,086,301 287,642,801
Weighted shares assumed upon exercise of stock options (in shares) 410,680 232,962
Diluted weighted average shares outstanding (in shares) 286,496,981 287,875,763