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Retirement Benefits
 6 Months Ended
Jun. 30, 2015
Retirement Benefits [Abstract]  
Retirement Benefits

11.    Retirement Benefits

Net periodic benefit (credit) cost of our U.S. pension plans (including our unfunded nonqualified plans), non-U.S. pension plans, and postretirement health care and life insurance benefit plans for the three months ended June 30, 2015 and 2014, respectively, follow:

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

U.S. Pension Plans

 

Non-U.S. Pension Plans

 

Other Benefit Plans

 

 

Three Months Ended June 30,

 

 

2015

 

2014

 

2015

 

2014

 

2015

 

2014

 

 

(Dollars in thousands)

Service cost

 

$
5 

 

$
5 

 

$
383 

 

$
460 

 

$

 —

 

$

 —

Interest cost

 

 
4,697 

 

 
4,924 

 

 
915 

 

 
1,314 

 

 
242 

 

 
300 

Expected return on plan assets

 

 
(7,291)

 

 
(7,034)

 

 
(674)

 

 
(808)

 

 

 —

 

 

 —

Amortization of prior service cost (credit)

 

 
3 

 

 
3 

 

 
15 

 

 
16 

 

 

 —

 

 
(26)

Net periodic benefit (credit) cost

 

$
(2,586)

 

$
(2,102)

 

$
639 

 

$
982 

 

$
242 

 

$
274 

 

Net periodic benefit (credit) cost for the six months ended June 30, 2015 and 2014, respectively, follow:

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

U.S. Pension Plans

 

Non-U.S. Pension Plans

 

Other Benefit Plans

 

 

Six Months Ended June 30,

 

 

2015

 

2014

 

2015

 

2014

 

2015

 

2014

 

 

(Dollars in thousands)

Service cost

 

$
9 

 

$
10 

 

$
774 

 

$
911 

 

$

 —

 

$

 —

Interest cost

 

 
9,395 

 

 
9,848 

 

 
1,838 

 

 
2,615 

 

 
485 

 

 
602 

Expected return on plan assets

 

 
(14,583)

 

 
(14,067)

 

 
(1,349)

 

 
(1,605)

 

 

 —

 

 

 —

Amortization of prior service cost (credit)

 

 
6 

 

 
6 

 

 
30 

 

 
31 

 

 

 —

 

 
(53)

Net periodic benefit (credit) cost

 

$
(5,173)

 

$
(4,203)

 

$
1,293 

 

$
1,952 

 

$
485 

 

$
549 

 

Net periodic benefit (credit) for our U.S. pension plans for the six months ended June 30, 2015, increased from the effects of larger plan asset balances resulting in increased expected returns in addition to the effect of a lower discount rate. Net periodic benefit cost for our non-U.S. pension plans decreased primarily due to the change in the discount rate. Net periodic benefit cost for our postretirement health care and life insurance benefit plans did not change significantly compared with the prior year.