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COMPONENTS OF PENSION PLAN NET PERIODIC BENEFIT COSTS (Tables)
 9 Months Ended
Sep. 30, 2017
Pension Plan  
Employee Benefit Plans  
Components of net periodic benefit cost

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

    

Three Months Ended

 

Nine Months Ended

 

 

 

September 30, 

 

September 30, 

 

 

 

2017

    

2016

    

2017

    

2016

    

 

 

(in thousands)

 

Service cost

 

$

 —

 

$

524

 

$

 —

 

$

1,720

 

Interest cost

 

 

1,138

 

 

1,118

 

 

3,408

 

 

3,381

 

Expected return on plan assets

 

 

(1,240)

 

 

(1,363)

 

 

(3,743)

 

 

(3,937)

 

Amortization of prior service cost (1)

 

 

46

 

 

 —

 

 

140

 

 

 —

 

Amortization of net loss (1)

 

 

774

 

 

787

 

 

2,319

 

 

2,365

 

Net periodic benefit cost

 

$

718

 

$

1,066

 

$

2,124

 

$

3,529

 

(1)

Amortization of prior service cost and net actuarial loss is included in the Operating expenses (excluding depreciation, depletion and amortization) line item within our condensed consolidated statements of income.