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Defined Pension Plans (Tables)
3 Months Ended
Mar. 31, 2019
Retirement Benefits [Abstract]  
Schedule of Net Periodic Pension Costs

The following table represents the components of the net periodic pension costs:

      Estimated       Actual
(In thousands) 2019 2018
Service cost benefits earned during the year $ 3,708 $ 4,017
Interest cost on projected benefit obligations 4,083 3,703
Expected return on plan assets (4,754) (5,202)
Net amortization 1,634 1,522
Net periodic pension cost $      4,671 $      4,040
Schedule of Unfunded Supplemental Executive Retirement Plan

The following table represents the components of the net periodic pension costs for 2018 and an estimate for 2019:

Estimated Actual
(In thousands)       2019       2018
Service cost benefits earned during the year $ 97 $ 92
Interest cost on projected benefit obligation 408 348
Net amortization 276 581
Net periodic pension cost $      781 $      1,021