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Stock-Based Compensation and Directors Stock Purchase Plan (Summary Of SAR Activity) (Details)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2020
USD ($)
$ / shares
shares
Stock Appreciation Rights, Shares [Roll Forward]  
Outstanding, Shares, Beginning Balance | shares 1,101,905
Granted, Shares | shares 108,262
Forfeited, Shares | shares (7,717)
Expired, Shares | shares (576)
Exercised, Shares | shares (195,978)
Outstanding, Shares, Ending Balance | shares 1,005,896
Exercisable, Shares, Ending Balance | shares 600,469
Stock Appreciation Rights, Weighted Average Exercise Price [Roll Forward]  
Outstanding, Weighted Average Exercise Price, Beginning Balance | $ / shares $ 41.48
Share based compensation arrangement by share based payment award equity instruments other than options grants in period weighted average exercise price | $ / shares 60.17
Share-based Compensation Arrangement by Share-based Payment Award, Other than Options, Forfeitures and Expirations in Period, Weighted Average Exercise Price | $ / shares 55.27
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Expired In Period Weighted Average Exercise Price | $ / shares 51.70
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Exercised In Period Weighted Average Exercise Price | $ / shares 33.43
Outstanding, Weighted Average Exercise Price, Ending Balance | $ / shares 44.95
Exercisable, Weighted Average Exercise Price, Ending Balance | $ / shares $ 38.30
Outstanding, Weighted Average Remaining Contractual Term (in years) 6 years 2 months 12 days
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Outstanding | $ $ 20,875
Exercisable, Weighted Average Remaining Contractual Term (in years) 5 years
Exercisable, Aggregate Intrinsic Value, Ending Balance | $ $ 16,452