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Retirement Benefits (Tables)
 6 Months Ended
Jun. 30, 2016
Compensation and Retirement Disclosure [Abstract]  
Components of Net Periodic Benefit Cost

The components of the net periodic pension benefit cost (credit) were as follows:

 
Three Months Ended
 
Six Months Ended
 
June 30,
2016
 
June 30,
2015
 
June 30,
2016
 
June 30,
2015
 
(Dollars in thousands)
Service cost
$
3,321

 
$
3,951

 
$
6,634

 
$
8,001

Interest cost
6,444

 
7,142

 
12,878

 
14,291

Expected return on plan assets
(14,583
)
 
(15,698
)
 
(29,166
)
 
(31,353
)
Amortization of prior service cost
151

 
268

 
302

 
514

Amortization of actuarial losses
2,084

 
1,833

 
4,167

 
3,666

Special termination benefits
2,900

 
—

 
2,900

 
—

Curtailment loss
180

 
—

 
180

 
—

Net periodic benefit cost (credit)
$
497

 
$
(2,504
)
 
$
(2,105
)
 
$
(4,881
)
 
Special termination benefits and curtailment loss were included in rationalization charges for our metal container business segment in each of the three and six months ended June 30, 2016.

The components of the net periodic other postretirement benefit credit were as follows:
 
Three Months Ended
 
Six Months Ended
 
June 30,
2016
 
June 30,
2015
 
June 30,
2016
 
June 30,
2015
 
(Dollars in thousands)
Service cost
$
69

 
$
136

 
$
136

 
$
279

Interest cost
253

 
349

 
507

 
709

Amortization of prior service credit
(850
)
 
(736
)
 
(1,700
)
 
(1,472
)
Amortization of actuarial gains
(170
)
 
(63
)
 
(288
)
 
(127
)
Net periodic benefit credit
$
(698
)
 
$
(314
)
 
$
(1,345
)
 
$
(611
)