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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, 2016
Dec. 31, 2015
Dec. 31, 2014
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 4.29% 4.55% 4.17%
Defined Benefit Plan Assumption Expected Long Term Return On Assets At Year End 6.50% 7.00% 7.50%
Weighted-average assumptions used to determine net periodic benefit cost:      
Discount rate 4.55% 4.17% 4.99%
Expected long-term return on plan assets 7.00% 7.50% 7.75%
Components of net periodic benefit cost:      
Service cost $ 231 $ 530 $ 869
Interest cost 13,323 13,217 13,397
Expected return on plan assets (15,980) (17,636) (18,301)
Amortization of prior service costs and gains or losses 13,312 16,190 10,688
Settlement/curtailment 0 45 81
Net periodic benefit cost $ 10,886 $ 12,346 $ 6,734
Other Post-Retirement Benefits      
Weighted-average assumptions used to determine benefit obligations:      
Discount rate 4.24% 4.49% 4.11%
Weighted-average assumptions used to determine net periodic benefit cost:      
Discount rate 4.49% 4.11% 4.88%
Components of net periodic benefit cost:      
Service cost $ 38 $ 44 $ 43
Interest cost 337 325 387
Expected return on plan assets 0 0 0
Amortization of prior service costs and gains or losses (214) (194) (190)
Settlement/curtailment 0 0 0
Net periodic benefit cost $ 161 $ 175 $ 240