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Savings and Retirement Plans (Tables)
 9 Months Ended
Sep. 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 nine-month periods ended September 30:

  
Three Months Ended
September 30
  
Nine Months Ended
September 30
 
  
2016
  
2015
  
2016
  
2015
 
             
Gross service cost
 
$
28,000
  
$
36,000
  
$
83,000
  
$
102,000
 
Interest cost
  
29,000
   
24,000
   
87,000
   
77,000
 
Expected return on assets
  
(24,000
)
  
(19,000
)
  
(72,000
)
  
(59,000
)
Amortization
  
(2,000
)
  
7,000
   
(5,000
)
  
14,000
 
Net periodic retirement cost
 
$
31,000
  
$
48,000
  
$
93,000
  
$
134,000