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Pension and Postretirement Benefits (Tables)
 3 Months Ended
Mar. 31, 2018
Compensation And Retirement Disclosure [Abstract]  
Schedule of Components of Net Periodic Benefit Cost (Credit)

The estimated components of the recorded net periodic benefit cost (credit) for pension and postretirement benefits are as follows:

 

 

 

Three-Months Ended March 31,

 

 

 

Pension

 

 

Postretirement Benefits

 

 

 

2018

 

 

2017

 

 

2018

 

 

2017

 

 

 

(Dollars in Thousands)

 

Service cost

 

$

8,148

 

 

$

6,572

 

 

$

22

 

 

$

24

 

Interest cost

 

 

8,361

 

 

 

9,008

 

 

 

125

 

 

 

185

 

Expected return on assets

 

 

(10,629

)

 

 

(9,936

)

 

 

—

 

 

 

—

 

Amortization of:

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Prior service cost (credit)

 

 

26

 

 

 

78

 

 

 

(611

)

 

 

(435

)

Actuarial loss (gain)

 

 

3,296

 

 

 

3,524

 

 

 

(57

)

 

 

(72

)

Net periodic benefit cost (credit)

 

$

9,202

 

 

$

9,246

 

 

$

(521

)

 

$

(298

)