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Retirement Plans (Tables)
 3 Months Ended
Mar. 31, 2018
Retirement Plans [Abstract]  
Components of Net Periodic Benefits Cost



 

 

 

 

 

 

 

 

 

 

 

 



 

 

 

 

 

 

 

 

 

 

 

 



 

 

 

 

 

 

 

Other Post-

(in thousands)

 

Pension Benefits

 

Retirement Benefits

Three months Ended March 31,

 

2018

 

2017

 

2018

 

2017

Service cost

 

$

 2,925 

 

$

 3,750 

 

$

 35 

 

$

 48 

Interest cost

 

 

 3,923 

 

 

 4,123 

 

 

 137 

 

 

 180 

Expected return on plan assets

 

 

 (9,700)

 

 

 (8,750)

 

 

 —

 

 

 —

Amortization of net loss and prior service costs

 

 

 1,326 

 

 

 1,435 

 

 

 (149)

 

 

 (48)

Net periodic benefit cost (reduction of cost)

 

$

 (1,526)

 

$

 558 

 

$

 23 

 

$

 180