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Property and Equipment (Tables)
 12 Months Ended
Dec. 31, 2015
Property and Equipment [Abstract]  
Property and equipment
Property and equipment consist of the following:

  
December 31
 
  
2015
  
2014
 
Land
 
$
12,628
  
$
14,024
 
Building and land improvements
  
132,353
   
146,266
 
Manufacturing and office equipment
  
214,545
   
235,623
 
Aviation equipment
  
14,151
   
13,698
 
Less accumulated depreciation
  
(203,471
)
  
(222,001
)
Total
 
$
170,206
  
$
187,610