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Employee Benefit Plans
 6 Months Ended
Jun. 30, 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 June 30,
 
Six Months Ended June 30,
 
U.S. Plan
 
Non-U.S. Plans
 
U.S. Plan
 
Non-U.S. Plans
 
2016
 
2015
 
2016
 
2015
 
2016
 
2015
 
2016
 
2015
Service Cost
$
3,479

 
$
3,916

 
$
1,405

 
$
1,663

 
$
6,957

 
$
7,831

 
$
2,778

 
$
3,351

Interest Cost
5,761

 
5,791

 
1,394

 
1,476

 
11,523

 
11,582

 
2,769

 
2,962

Expected return on plan assets
(9,699
)
 
(10,393
)
 
(1,974
)
 
(2,011
)
 
(19,397
)
 
(20,786
)
 
(3,922
)
 
(4,030
)
Amortization:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Prior service cost
183

 
224

 
(100
)
 
22

 
366

 
448

 
(199
)
 
45

Recognized actuarial loss
1,610

 
3,155

 
675

 
661

 
3,219

 
6,310

 
1,340

 
1,336

Transition obligation
—

 
—

 
1

 
9

 
—

 
—

 
2

 
18

Curtailments, special termination benefits, and settlements
—

 
—

 
—

 
1

 


 
810

 


 
3

Net periodic expense
$
1,334

 
$
2,693

 
$
1,401

 
$
1,821

 
$
2,668

 
$
6,195

 
$
2,768

 
$
3,685



Non-Qualified Supplemental Benefits
 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
2016
 
2015
 
2016
 
2015
Service Cost
$
739

 
$
935

 
$
1,479

 
$
1,870

Interest Cost
1,317

 
1,265

 
2,634

 
2,531

Amortization:
 
 
 
 
 
 
 
   Prior service cost
1,566

 
1,732

 
3,133

 
3,464

   Recognized actuarial (gain) loss
(140
)
 
72

 
(280
)
 
143

Net periodic expense
$
3,482

 
$
4,004

 
$
6,966

 
$
8,008



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 June 30,
 
Six Months Ended June 30,
 
2016
 
2015
 
2016
 
2015
Service Cost
$
13

 
$
40

 
$
26

 
$
81

Interest Cost
104

 
128

 
209

 
256

Amortization:
 
 
 
 
 
 
 
   Prior service cost
(35
)
 
(93
)
 
(71
)
 
(186
)
   Recognized actuarial gain
(59
)
 
(7
)
 
(118
)
 
(15
)
Net periodic expense
$
23

 
$
68

 
$
46

 
$
136



The total amount amortized out of accumulated other comprehensive income into net periodic pension and post-retirement expense totaled $3,701 and $5,775 for the three months ended June 30, 2016 and 2015, respectively, and $7,392 and $11,563 for the six months ended June 30, 2016 and 2015, 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 $8,349, and $8,005 for the three months ended June 30, 2016 and 2015, respectively, and $18,157 and $17,011 for the six months ended June 30, 2016 and 2015.