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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, 2021
Dec. 31, 2020
Dec. 31, 2019
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 213,848 215,072 227,301
Grants (in shares) 56,536 63,104 58,878
Changes due to performance (in shares) 52,296 27,921 21,740
Payments (in shares) (68,622) (80,808) (69,912)
Forfeitures (in shares) (5,644) (11,441) (22,935)
Shares potentially payable, ending balance 248,414 213,848 215,072
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) $ 74.22 $ 73.04 $ 70.67
Cash paid for share based liabilities $ 5,093 $ 5,848 $ 5,528