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Retirement and Benefit Plans
 9 Months Ended
Sep. 30, 2014
Compensation and Retirement Disclosure [Abstract]  
Retirement and Benefit Plans
Retirement and Benefit Plans
 
The following table presents the pension benefit costs:
 
 
Three Months Ended
September 30
 
Nine Months Ended
September 30
 
2014
 
2013
 
2014
 
2013
 
(thousands)
Service cost
$
433

 
$
672

 
$
1,248

 
$
2,014

Interest cost
5,050

 
4,667

 
15,130

 
13,959

Expected return on plan assets
(5,238
)
 
(5,025
)
 
(15,764
)
 
(14,807
)
Amortization of actuarial (gain) loss
(5
)
 
2,333

 
(17
)
 
6,870

Amortization of prior service costs
—

 
23

 
—

 
68

Net periodic benefit cost
$
240

 
$
2,670

 
$
597

 
$
8,104


 
In the first nine months of 2014, we contributed $11.7 million in cash to the pension plans. For the remainder of 2014, we expect to make approximately $0.4 million in additional cash contributions to the pension plans.