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Share-Based Compensation (Summary Of Vested And Unvested RSU) (Details) - Restricted Stock And Restricted Stock Unit [Member] - $ / shares
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]      
Outstanding shares, Beginning balance (in shares) 75,250 169,000 271,000
Vested, shares (in shares) 0 0 (82,000)
Forfeited/canceled, shares (in shares) (6,000) (8,000) (20,000)
Expired, shares (in shares) (69,250) (85,750) 0
Outstanding shares, Ending balance (in shares) 0 75,250 169,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]      
Outstanding, Weighted-Average Fair Value per Share, Beginning (in dollars per share) $ 53.49 $ 53.66 $ 51.09
Vested, Weighted-Average Fair Value per Share (in dollars per share) 0 0 45.17
Forfeited/Canceled, Weighted-Average Fair Value per Share (in dollars per share) 53.49 53.49 53.62
Expired, Weighted-Average Fair Value per Share (in dollars per share) 53.49 53.80 0
Outstanding, Weighted-Average Fair Value per Share, Ending (in dollars per share) $ 0 $ 53.49 $ 53.66