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Employee Benefit Plans
 3 Months Ended
Mar. 31, 2016
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, 2016 and 2015 were as follows (dollars in thousands):
 
 
Pension Benefits
 
Other Benefits
 
 
Three months ended March 31,
 
Three months ended March 31,
 
 
2016
 
2015
 
2016
 
2015
Service cost
 
$
2,306

 
$
2,030

 
$
1,016

 
$
589

Interest cost
 
1,259

 
1,243

 
643

 
491

Expected return on plan assets
 
(1,224
)
 
(1,118
)
 
—

 
—

Amortization of prior service cost
 
78

 
83

 
—

 
—

Amortization of prior actuarial loss
 
857

 
439

 
616

 
265

Net periodic benefit cost
 
$
3,276

 
$
2,677

 
$
2,275

 
$
1,345


The Company has made no pension contributions during the first three months of 2016, and expects to make pension contributions of $8.0 million in 2016.