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Stockholders' Equity - Reconciliation of Denominators used in Computation of Basic and Diluted Earnings Per Share (Details) - shares
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Stockholders' Equity Note [Abstract]        
Basic weighted average shares outstanding (in shares) 288,655,020 288,918,945 288,948,734 288,863,482
Weighted shares assumed upon exercise of stock options (in shares) 133,943 200,525 150,582 268,820
Diluted weighted average shares outstanding (in shares) 288,788,963 289,119,470 289,099,316 289,132,302