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Employee Benefit Plans (Tables)
3 Months Ended
Mar. 31, 2019
Defined Benefit Pension Plans And Defined Benefit Postretirement Plans Disclosure [Abstract]  
Components Of Net Periodic Benefit Expense

 

 

 

Three months ended

March 31,

 

 

 

2019

 

 

2018

 

Service cost

 

$

802

 

 

$

836

 

Interest cost on projected benefit obligation

 

 

695

 

 

 

598

 

Expected return on plan assets

 

 

(1,184

)

 

 

(1,321

)

Amortization of unrecognized prior service credit

 

 

(16

)

 

 

(18

)

Amortization of unrecognized net actuarial loss

 

 

366

 

 

 

187

 

Net periodic benefit expense

 

$

663

 

 

$

282