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Stockholders' Equity (Reconciliation Of Denominators Used In The Computation Of Basic And Diluted Earnings Per Share) (Details) - shares
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Stockholders' Equity Note [Abstract]      
Basic weighted average shares outstanding (in shares) 291,453,107 296,490,378 296,754,160
Weighted shares assumed upon exercise of stock options (in shares) 592,335 822,866 929,428
Diluted weighted average shares outstanding (in shares) 292,045,442 297,313,244 297,683,588