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Incentive Plans (Schedules of Other Share-based Compensation Activity) (Details) - Restricted Stock - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]      
Shares potentially payable, beginning balance 215,072 227,301 236,096
Grants (in shares) 63,104 58,878 65,370
Changes due to performance (in shares) 27,921 21,740 14,343
Payments (in shares) (80,808) (69,912) (75,545)
Forfeitures (in shares) (11,441) (22,935) (12,963)
Shares potentially payable, ending balance 213,848 215,072 227,301
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]      
Payments (in dollars per share) $ 73.04 $ 70.67 $ 62.69
Cash paid for share based liabilities $ 5,848 $ 5,528 $ 4,736