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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, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Stockholders' Equity Note [Abstract]        
Basic weighted average shares outstanding 289,917,768 296,595,100 292,083,511 296,642,783
Weighted shares assumed upon exercise of stock options 556,771 782,494 637,126 842,300
Diluted weighted average shares outstanding 290,474,539 297,377,594 292,720,637 297,485,083