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Pension And Other Post-Retirement Benefits (Tables)
6 Months Ended
Jun. 30, 2021
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]  
Schedule Of Components Of Net Periodic Benefit Cost For Pension And Other Post-Retirement Benefit Programs The components of net periodic benefit cost for the pension and other postretirement benefit programs reflected in the consolidated statements of income for the three and six months ended June 30, 2021 and 2020, are shown below:
Pension BenefitsOther Post-Retirement Benefits
 Three Months Ended June 30,Three Months Ended June 30,
(In thousands)2021202020212020
Service cost$— $— $$
Interest cost2,102 2,535 51 60 
Expected return on plan assets(2,863)(2,804)— — 
Amortization of prior service costs, (gains) losses and net transition asset4,266 3,814 (24)(47)
Net periodic benefit cost$3,505 $3,545 $35 $22 
Pension BenefitsOther Post-Retirement Benefits
 Six Months Ended June 30,Six Months Ended June 30,
(In thousands)2021202020212020
Service cost$— $— $17 $18 
Interest cost4,204 5,070 101 120 
Expected return on plan assets(5,725)(5,608)— — 
Amortization of prior service costs, (gains) losses and net transition asset
8,531 7,628 (48)(94)
Net periodic benefit cost$7,010 $7,090 $70 $44