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Segments
 12 Months Ended
Dec. 31, 2018
Segment Reporting [Abstract]  
Segments
Segments

The following table summarizes certain financial data related to our segments. Transactions between segments are recorded based on prices negotiated between the segments. Sales of units represents the selling price of our units plus freight and other miscellaneous charges less any returns and allowances. Parts includes sales of purchased and fabricated parts including our coils along with the related freight and less any returns and allowances. The “Other” category in the table below includes certain sales cost and expenses that are not allocated to the reportable segments.

Asset information by segment is not easily identifiable or reviewed by the chief operating decision maker. As such, this information is not included below.
 
Years Ending December 31,
 
2018
 
2017
 
2016
 
(in thousands)
Sales
 
 
 
 
 
     Units
406,331

 
384,853

 
363,666

     Parts - External
28,456

 
22,050

 
21,692

     Parts - Inter-segment
29,385

 
29,293

 
25,406

     Other
(840
)
 
(1,671
)
 
(1,381
)
     Eliminations
(29,385
)
 
(29,293
)
 
(25,406
)
             Net sales
433,947

 
405,232

 
383,977

 
 

 
 
 
 

Gross Profit
 
 
 
 
 
     Units
108,214

 
128,571

 
120,940

     Parts - External
13,215

 
9,377

 
9,967

     Parts - Inter-segment
865

 
426

 
(105
)
     Other
(17,896
)
 
(14,551
)
 
(12,827
)
     Eliminations
(865
)
 
(426
)
 
105

             Net gross profit
103,533

 
123,397

 
118,080