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Stock-Based Compensation (Schedule Of Non-Vested Performance Share Award Activity) (Details) - Performance Shares [Member]
9 Months Ended
Sep. 30, 2020
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Non-vested, shares or units | shares 285,403
Non-vested, Weighted-Average Grant-Date Fair Value | $ / shares $ 16.38
Granted, shares or units | shares 232,566
Granted, Weighted-Average Grant-Date Fair Value | $ / shares $ 10.64
Non-vested, shares or units | shares 517,969
Non-vested, Weighted-Average Grant-Date Fair Value | $ / shares $ 13.80
Non-vested, Weighted-Average Remaining Vesting Term (in years) 2 years