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Employee Benefit Plans
 3 Months Ended
Mar. 31, 2017
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
 
2017
 
2016
 
2017
 
2016
Service cost
$
3,021

 
$
3,478

 
$
1,317

 
$
1,373

Interest cost
5,429

 
5,762

 
1,264

 
1,375

Expected return on plan assets
(9,953
)
 
(9,698
)
 
(1,804
)
 
(1,948
)
Amortization:
 
 
 
 
 
 
 
Prior service cost (credit)
107

 
183

 
(110
)
 
(99
)
Recognized actuarial loss
1,396

 
1,609

 
841

 
665

Transition obligation
—

 
—

 
1

 
1

Net periodic expense
$
—

 
$
1,334

 
$
1,509

 
$
1,367



Non-Qualified Supplemental Benefits
 
Three Months Ended March 31,
 
2017
 
2016
Service cost
$
618

 
$
740

Interest cost
1,019

 
1,317

Amortization:
 
 
 
   Prior service cost
1,102

 
1,567

   Recognized actuarial gain
(298
)
 
(140
)
Net periodic expense
$
2,441

 
$
3,484



Post-Retirement Benefit Plans

The Company also maintains post-retirement benefit plans, although these plans are 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,
 
2017
 
2016
Service cost
$
8

 
$
13

Interest cost
73

 
105

Amortization:
 
 
 
   Prior service cost (credit)
2

 
(36
)
   Recognized actuarial gain
(40
)
 
(59
)
Net periodic expense
$
43

 
$
23



The total amount amortized out of accumulated other comprehensive earnings into net periodic pension and post-retirement expense totaled $3,001 and $3,691 for the three months ended March 31, 2017 and 2016, respectively.

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 $11,358, and $9,808 for the three months ended March 31, 2017 and 2016, respectively.