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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, 2017
Dec. 31, 2016
Dec. 31, 2015
Weighted-average assumptions used to determine benefit obligations:      
Defined Benefit Plan Assumption Expected Long Term Return On Assets At Year End 6.50%    
Pension Benefits      
Weighted-average assumptions used to determine benefit obligations:      
Discount rate 3.72% 4.29% 4.55%
Defined Benefit Plan Assumption Expected Long Term Return On Assets At Year End 6.50% 6.50% 7.00%
Weighted-average assumptions used to determine net periodic benefit cost:      
Discount rate 4.29% 4.55% 4.17%
Expected long-term return on plan assets 6.50% 7.00% 7.50%
Components of net periodic benefit cost:      
Service cost $ 194 $ 231 $ 530
Interest cost 12,575 13,323 13,217
Expected return on plan assets (14,955) (15,980) (17,636)
Amortization of prior service costs and gains or losses 12,320 13,312 16,190
Settlement/curtailment 0   45
Net periodic benefit cost $ 10,134 $ 10,886 $ 12,346
Other Post-Retirement Benefits      
Weighted-average assumptions used to determine benefit obligations:      
Discount rate 3.69% 4.24% 4.49%
Weighted-average assumptions used to determine net periodic benefit cost:      
Discount rate 4.24% 4.49% 4.11%
Components of net periodic benefit cost:      
Service cost $ 33 $ 38 $ 44
Interest cost 301 337 325
Expected return on plan assets 0 0 0
Amortization of prior service costs and gains or losses (275) (214) (194)
Settlement/curtailment 0 0 0
Net periodic benefit cost $ 59 $ 161 $ 175