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Foreign Operations (Tables)
12 Months Ended
Dec. 31, 2017
Segment Reporting [Abstract]  
Sales and property and equipment, net by country
The following table provides information related to sales by country, based on the ship to location of customers' production facilities, for the years ended December 31:
 
2017
 
2016
 
2015
United States
$
103,513,000

 
$
119,018,000

 
$
129,651,000

Mexico
52,496,000

 
51,389,000

 
63,586,000

Canada
5,664,000

 
4,475,000

 
5,831,000

Total
$
161,673,000

 
$
174,882,000

 
$
199,068,000


The following table provides information related to the location of property, plant and equipment, net, as of December 31:
 
2017
 
2016
United States
$
40,594,000

 
$
42,547,000

Mexico
28,037,000

 
28,054,000

Total
$
68,631,000

 
$
70,601,000