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Employee Benefit Plans
 3 Months Ended
Mar. 31, 2016
Defined Benefit Pension Plans and Defined Benefit Postretirement Plans Disclosure [Abstract]  
Employee Benefit Plans
13. Employee Benefit Plans

Retirement Plans

The Company offers defined contribution retirement plans which cover the majority of its U.S. employees, as well as employees in certain other countries. In addition, the Company sponsors qualified defined benefit pension plans covering certain employees of the Company and its subsidiaries. The plans’ benefits are generally based on years of service and employee compensation. The Company also provides to certain management employees, through non-qualified plans, supplemental retirement benefits in excess of qualified plan limits imposed by federal tax law.

The following tables set forth the components of the Company’s net periodic expense relating to retirement benefit plans:

Qualified Defined Benefits
 
Three Months Ended March 31,
 
U.S. Plan
 
Non-U.S. Plans
 
2016
 
2015
 
2016
 
2015
Service Cost
$
3,478

 
$
3,915

 
$
1,373

 
$
1,688

Interest Cost
5,762

 
5,791

 
1,375

 
1,486

Expected return on plan assets
(9,698
)
 
(10,393
)
 
(1,948
)
 
(2,019
)
Amortization:
 
 
 
 
 
 
 
Prior service cost
183

 
224

 
(99
)
 
23

Recognized actuarial loss
1,609

 
3,155

 
665

 
675

Transition obligation
—

 
—

 
1

 
9

Curtailments, special termination benefits, and settlements
—

 
810

 
—

 
2

Net periodic expense
$
1,334

 
$
3,502

 
$
1,367

 
$
1,864



Non-Qualified Supplemental Benefits
 
Three Months Ended March 31,
 
2016
 
2015
Service Cost
$
740

 
$
935

Interest Cost
1,317

 
1,266

Amortization:
 
 
 
   Prior service cost
1,567

 
1,732

   Recognized actuarial (gain) loss
(140
)
 
71

Net periodic expense
$
3,484

 
$
4,004



Post-Retirement Plans

The Company also maintains post retirement benefit plans, although these plans are effectively closed to new entrants. The supplemental and post retirement benefit plans are supported by the general assets of the Company. The following table sets forth the components of the Company’s net periodic expense relating to its post-retirement benefit plans:

 
Three Months Ended March 31,
 
2016
 
2015
Service Cost
$
13

 
$
41

Interest Cost
105

 
128

Amortization:
 
 
 
   Prior service cost
(36
)
 
(93
)
   Recognized actuarial gain
(59
)
 
(8
)
Net periodic expense
$
23

 
$
68



Defined Contribution Retirement Plans

The Company also offers defined contribution retirement plans which cover the majority of its U.S. employees, as well as employees in certain other countries. The Company’s expense relating to defined contribution plans was $9,808, and $9,006 for the three months ended March 31, 2016 and 2015, respectively.