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Employee Benefit Plans
 3 Months Ended
Mar. 31, 2015
Compensation and Retirement Disclosure [Abstract]  
Employee Benefit Plans
Employee Benefit Plans
The components of net periodic benefit costs for the three months ended March 31, 2015 and 2014 were as follows (dollars in thousands):
 
 
Pension Benefits
 
Other Benefits
 
 
Three months ended March 31,
 
Three months ended March 31,
 
 
2015
 
2014
 
2015
 
2014
Service cost
 
$
2,030

 
$
1,501

 
$
589

 
$
470

Interest Cost
 
1,243

 
808

 
491

 
338

Expected return on plan assets
 
(1,118
)
 
(933
)
 
—

 
—

Amortization of prior service cost
 
83

 
2

 
—

 
—

Amortization of prior actuarial loss
 
439

 
673

 
265

 
217

Net periodic benefit cost
 
$
2,677

 
$
2,051

 
$
1,345

 
$
1,025



The Company has made no pension contributions during the first three months of 2015, and expects to make total pension contributions of $3.7 million in 2015.