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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, 2017
Mar. 31, 2016
Stockholders' Equity Note [Abstract]    
Basic weighted average shares outstanding (in shares) 289,242,447 288,808,019
Weighted shares assumed upon exercise of stock options (in shares) 213,494 315,584
Diluted weighted average shares outstanding (in shares) 289,455,941 289,123,603