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Segments (Tables)
 3 Months Ended
Mar. 31, 2019
Segment Reporting [Abstract]  
Schedule of Segment Reporting Information, by Segment [Table Text Block]
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 include 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.

 
Three Months Ended 
 March 31,
 
2019
 
2018
 
(in thousands)
Sales
 
 
 
     Units
107,068

 
92,975

     Parts - External
6,911

 
6,287

     Parts - Inter-segment
7,922

 
7,284

     Other
(157
)
 
(180
)
     Eliminations
(7,922
)
 
(7,284
)
             Net sales
113,822

 
99,082

 
 
 
 

Gross Profit
 
 
 
     Units
26,543

 
16,540

     Parts - External
3,684

 
3,029

     Parts - Inter-segment
677

 
795

     Other
(4,434
)
 
(4,179
)
     Eliminations
(677
)
 
(795
)
             Net gross profit
25,793

 
15,390