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Retirement Plans And Other Postretirement Benefits (Components Of Net Periodic Benefit Income Or Cost For Continuing Operations) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Weighted-average assumptions used to determine benefit obligations:      
Defined Benefit Plan Assumption Expected Long Term Return On Assets At Year End 5.00%    
Pension Benefits      
Weighted-average assumptions used to determine benefit obligations:      
Discount rate 3.27% 4.40% 3.72%
Defined Benefit Plan Assumption Expected Long Term Return On Assets At Year End 5.00% 6.00% 6.50%
Weighted-average assumptions used to determine net periodic benefit cost:      
Discount rate 4.40% 3.72% 4.29%
Expected long-term return on plan assets 6.00% 6.50% 6.50%
Components of net periodic benefit cost:      
Service cost $ 0 $ 17 $ 194
Interest cost 12,222 11,442 12,575
Expected return on plan assets (13,528) (15,011) (14,955)
Amortization of prior service costs and gains or losses 10,891 13,894 12,320
Net periodic benefit cost $ 9,585 $ 10,342 $ 10,134
Other Post-Retirement Benefits      
Weighted-average assumptions used to determine benefit obligations:      
Discount rate 3.25% 4.37% 3.69%
Weighted-average assumptions used to determine net periodic benefit cost:      
Discount rate 4.37% 3.69% 4.24%
Components of net periodic benefit cost:      
Service cost $ 26 $ 36 $ 33
Interest cost 290 271 301
Expected return on plan assets 0 0 0
Amortization of prior service costs and gains or losses (258) (243) (275)
Net periodic benefit cost $ 58 $ 64 $ 59