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Employee Benefit Plans
 6 Months Ended
Jun. 30, 2016
Compensation and Retirement Disclosure [Abstract]  
Employee Benefit Plans
Employee Benefit Plans
The components of net periodic benefit costs for the three and six months ended June 30, 2016 and 2015 were as follows (dollars in thousands):
 
 
Pension Benefits
 
Other Benefits
 
 
Three months ended June 30,
 
Three months ended June 30,
 
 
2016
 
2015
 
2016
 
2015
Service cost
 
$
2,652

 
$
2,586

 
$
1,015

 
$
589

Interest cost
 
1,076

 
1,283

 
643

 
491

Expected return on plan assets
 
(1,345
)
 
(1,331
)
 
—

 
—

Amortization of prior service cost
 
75

 
80

 
—

 
—

Amortization of prior actuarial loss
 
1,224

 
833

 
617

 
265

Net periodic benefit cost
 
$
3,682

 
$
3,451

 
$
2,275

 
$
1,345


 
 
Pension Benefits
 
Other Benefits
 
 
Six months ended June 30,
 
Six months ended June 30,
 
 
2016
 
2015
 
2016
 
2015
Service cost
 
$
4,958

 
$
4,616

 
$
2,031

 
$
1,178

Interest cost
 
2,335

 
2,526

 
1,286

 
982

Expected return on plan assets
 
(2,569
)
 
(2,449
)
 
—

 
—

Amortization of prior service cost
 
153

 
163

 
—

 
—

Amortization of prior actuarial loss
 
2,081

 
1,272

 
1,233

 
530

Net periodic benefit cost
 
$
6,958

 
$
6,128

 
$
4,550

 
$
2,690

The Company has made $4.0 million in pension contributions during the first six months of 2016 and expects to make total pension contributions of $8.0 million in 2016.