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Savings and Retirement Plans
 6 Months Ended
Jun. 30, 2016
Savings and Retirement Plans [Abstract]  
Savings and Retirement Plans
Note 11.Savings and Retirement Plans

We sponsor various retirement plans for eligible employees in the United States, the United Kingdom, and The Netherlands. Our retirement savings plan in the United States conforms to Section 401(k) of the Internal Revenue Code and participation is available to substantially all employees. We may also make discretionary contributions ratably to all eligible employees. We made discretionary contributions to the U.S. plan of $305,000 and $162,000 for the six months ended June 30, 2016, and 2015, respectively.

Our international subsidiaries have defined benefit retirement plans for eligible employees.  These plans provide benefits based on the employee’s years of service and compensation during the years immediately preceding retirement, termination, disability, or death, as defined in the plans.

The cost for our defined benefit retirement plans in The Netherlands and the United Kingdom includes the following components for the three- and six-month periods ended June 30:

  
Three Months Ended
June 30
  
Six Months Ended
June 30
 
  
2016
  
2015
  
2016
  
2015
 
             
Gross service cost
 
$
28,000
  
$
36,000
  
$
56,000
  
$
65,000
 
Interest cost
  
29,000
   
24,000
   
58,000
   
53,000
 
Expected return on assets
  
(24,000
)
  
(19,000
)
  
(49,000
)
  
(39,000
)
Amortization
  
(1,000
)
  
7,000
   
(3,000
)
  
7,000
 
Net periodic retirement cost
 
$
32,000
  
$
48,000
  
$
62,000
  
$
86,000