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Retirement Benefits
 9 Months Ended
Sep. 30, 2016
Compensation and Retirement Disclosure [Abstract]  
Retirement Benefits
Retirement Benefits

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

 
Three Months Ended
 
Nine Months Ended
 
Sept. 30, 2016
 
Sept. 30, 2015
 
Sept. 30, 2016
 
Sept. 30, 2015
 
(Dollars in thousands)
Service cost
$
2,950

 
$
3,688

 
$
9,584

 
$
11,689

Interest cost
6,473

 
6,753

 
19,351

 
21,044

Expected return on plan assets
(14,653
)
 
(15,692
)
 
(43,819
)
 
(47,045
)
Amortization of prior service cost
113

 
264

 
415

 
778

Amortization of actuarial losses
2,326

 
627

 
6,493

 
4,293

Special termination benefits
—

 
—

 
2,900

 
—

Curtailment (gain) loss
—

 
(482
)
 
180

 
(482
)
Net periodic benefit credit
$
(2,791
)
 
$
(4,842
)
 
$
(4,896
)
 
$
(9,723
)
 
Special termination benefits and curtailment loss were included in rationalization charges for our metal container business segment for the nine months ended September 30, 2016.

The components of the net periodic other postretirement benefit credit were as follows:
 
Three Months Ended
 
Nine Months Ended
 
Sept. 30, 2016
 
Sept. 30, 2015
 
Sept. 30, 2016
 
Sept. 30, 2015
 
(Dollars in thousands)
Service cost
$
52

 
$
56

 
$
188

 
$
335

Interest cost
230

 
256

 
737

 
965

Amortization of prior service credit
(816
)
 
(817
)
 
(2,516
)
 
(2,289
)
Amortization of actuarial gains
(187
)
 
(133
)
 
(475
)
 
(260
)
Net periodic benefit credit
$
(721
)
 
$
(638
)
 
$
(2,066
)
 
$
(1,249
)