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Savings and Retirement Plans (Tables)
 6 Months Ended
Jun. 30, 2016
Savings and Retirement Plans [Abstract]  
Components of Benefit Costs for Defined Benefit Retirement 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