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Stock-Based Compensation (Summary Of Stock-Based Awards) (Details)
shares in Thousands
3 Months Ended
Mar. 31, 2019
$ / shares
shares
Restricted Stock Units (RSUs) [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Non-vested shares outstanding, shares or units, beginning balance | shares 595
Granted, shares or units | shares 537
Vested, shares or units | shares (170)
Forfeited, shares or units | shares (18)
Non-vested shares outstanding, shares or units, ending balance | shares 944
Non-vested outstanding, weighted-average grant date fair value, beginning balance | $ / shares $ 28.93
Granted, weighted-average grant date fair value | $ / shares 27.63
Vested, weighted-average grant date fair value | $ / shares 27.7
Forfeited, weighted-average grant date fair value | $ / shares 30.42
Non-vested outstanding, weighted-average grant date fair value, ending balance | $ / shares $ 28.38
Performance-Based Restricted Stock Units [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Non-vested shares outstanding, shares or units, beginning balance | shares 319
Granted, shares or units | shares 188
Vested, shares or units | shares (57)
Forfeited, shares or units | shares (74)
Non-vested shares outstanding, shares or units, ending balance | shares 376
Non-vested outstanding, weighted-average grant date fair value, beginning balance | $ / shares $ 29.19
Granted, weighted-average grant date fair value | $ / shares 27.51
Vested, weighted-average grant date fair value | $ / shares 31.4
Forfeited, weighted-average grant date fair value | $ / shares 21.01
Non-vested outstanding, weighted-average grant date fair value, ending balance | $ / shares $ 28.96