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Stockholders' Equity (Reconciliation Of Denominators Used In Computation Of Basic And Diluted Earnings Per Share) (Details) - shares
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Stockholders' Equity Note [Abstract]      
Basic weighted average shares outstanding (in shares) 288,949,525 291,453,107 296,490,378
Weighted shares assumed upon exercise of stock options (in shares) 207,998 592,335 822,866
Diluted weighted average shares outstanding (in shares) 289,157,523 292,045,442 297,313,244