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Stock Compensation (Schedule Of Restricted Stock Award And Restricted Stock Unit Activity Footnote) (Details) - shares
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Performance-based Restricted Stock Units [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vested (shares) 31,396 67,893 30,946
Time-based Restricted Stock Units [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vested (shares) 599,071 437,132 510,942