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Employee Benefits
 6 Months Ended
Jun. 30, 2016
Compensation and Retirement Disclosure [Abstract]  
Employee Benefits
Employee Benefits:

Pension and other defined contribution retirement plan expenses included the following components:
U.S. Plans
Three Months Ended June 30,
 
Six Months Ended June 30,
(DOLLARS IN THOUSANDS)
2016
 
2015
 
2016
 
2015
Service cost for benefits earned
$
772

 
$
984

 
$
1,543

 
$
1,968

Interest cost on projected benefit obligation
6,006

 
5,954

 
12,013

 
11,907

Expected return on plan assets
(8,070
)
 
(8,083
)
 
(16,139
)
 
(16,165
)
Net amortization and deferrals
1,385

 
5,203

 
2,772

 
10,406

Net periodic benefit cost
93

 
4,058

 
189

 
8,116

Defined contribution and other retirement plans
2,211

 
2,093

 
4,612

 
4,228

Total expense
$
2,304

 
$
6,151

 
$
4,801

 
$
12,344

 
 
 
 
 
 
 
 
Non-U.S. Plans
Three Months Ended June 30,
 
Six Months Ended June 30,
(DOLLARS IN THOUSANDS)
2016
 
2015
 
2016
 
2015
Service cost for benefits earned
$
3,863

 
$
4,102

 
$
7,638

 
$
8,485

Interest cost on projected benefit obligation
6,372

 
6,151

 
12,737

 
12,543

Expected return on plan assets
(11,985
)
 
(12,440
)
 
(23,934
)
 
(25,390
)
Net amortization and deferrals
3,286

 
3,314

 
6,550

 
6,801

Net periodic benefit cost
1,536

 
1,127

 
2,991

 
2,439

Defined contribution and other retirement plans
1,763

 
1,693

 
3,470

 
3,288

Total expense
$
3,299

 
$
2,820

 
$
6,461

 
$
5,727


The Company expects to contribute a total of approximately $30 million to its non-U.S. pension plans during 2016. During the six months ended June 30, 2016, $20.0 million of contributions were made to the qualified U.S. pension plans, $17.3 million of contributions were made to the non U.S. plans and $2.2 million of benefit payments were made with respect to the Company's non-qualified U.S. pension plan.
Expense recognized for postretirement benefits other than pensions included the following components: 
 
Three Months Ended June 30,
 
Six Months Ended June 30,
(DOLLARS IN THOUSANDS)
2016
 
2015
 
2016
 
2015
Service cost for benefits earned
$
214

 
$
301

 
$
429

 
$
601

Interest cost on projected benefit obligation
787

 
1,082

 
1,574

 
2,164

Net amortization and deferrals
(1,355
)
 
(712
)
 
(2,710
)
 
(1,423
)
Total postretirement benefit (income) expense
$
(354
)
 
$
671

 
$
(707
)
 
$
1,342


The Company expects to contribute approximately $5 million to its postretirement benefits other than pension plans during 2016. In the six months ended June 30, 2016, $2.6 million of contributions were made.