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Retirement Plans (Tables)
 3 Months Ended
Mar. 31, 2017
Retirement Plans [Abstract]  
Components of Net Periodic Benefits Cost



 

 

 

 

 

 

 

 

 

 

 

 



 

 

 

 

 

 

 

 

 

 

 

 



 

 

 

 

 

 

 

Other Post-

(in thousands)

 

Pension Benefits

 

retirement Benefits

Three Months Ended March 31,

 

2017

 

2016

 

2017

 

2016

Service cost

 

$

 3,750 

 

$

 3,265 

 

$

 48 

 

$

 29 

Interest cost

 

 

 4,123 

 

 

 4,988 

 

 

 180 

 

 

 206 

Expected return on plan assets

 

 

 (8,750)

 

 

 (8,891)

 

 

 —

 

 

 —

Amortization of net loss

 

 

 1,435 

 

 

 1,468 

 

 

 (48)

 

 

 (31)

Net periodic benefit cost

 

$

 558 

 

$

 830 

 

$

 180 

 

$

 204