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Employee Benefit Plans (Tables)
9 Months Ended
Sep. 30, 2018
Defined Benefit Pension Plans And Defined Benefit Postretirement Plans Disclosure [Abstract]  
Components Of Net Periodic Benefit Expense

 

 

 

Three months ended

September 30,

 

 

Nine months ended

September 30,

 

 

 

2018

 

 

2017

 

 

2018

 

 

2017

 

Service cost

 

$

836

 

 

$

785

 

 

$

2,509

 

 

$

2,355

 

Interest cost on projected benefit obligation

 

 

598

 

 

 

613

 

 

 

1,793

 

 

 

1,840

 

Expected return on plan assets

 

 

(1,321

)

 

 

(1,193

)

 

 

(3,963

)

 

 

(3,581

)

Amortization of unrecognized prior service credit

 

 

(18

)

 

 

(12

)

 

 

(54

)

 

 

(38

)

Amortization of unrecognized net actuarial loss

 

 

188

 

 

 

291

 

 

 

563

 

 

 

874

 

Net periodic benefit expense

 

$

283

 

 

$

484

 

 

$

848

 

 

$

1,450