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Defined Pension Plans (Tables)
3 Months Ended
Mar. 31, 2018
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) 2018 2017
Service cost – benefits earned during the year $      4,294 $      3,733
Interest cost on projected benefit obligations 3,655 3,621
Expected return on plan assets (5,206 ) (4,681 )
Net amortization 1,409 1,382
Net periodic pension cost $ 4,152 $ 4,055
Schedule of Unfunded Supplemental Executive Retirement Plan

The following table represents the components of the net periodic pension costs for 2017 and an estimate for 2018:

Estimated Actual
(In thousands)       2018       2017
Service cost – benefits earned during the year $      92 $      143
Interest cost on projected benefit obligation 348 360
Net amortization 581 324
Net periodic pension cost $ 1,021 $ 827