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Segments
 6 Months Ended
Jun. 30, 2021
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 represent 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 expenses that are not allocated to the reportable segments and are primarily engineering related expenses.

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 EndedSix Months Ended
 June 30,
2021		June 30,
2020		June 30,
2021		June 30,
2020
 (in thousands)
Sales   
     Units$132,861 $117,720 $240,735 $248,440 
     Parts - External11,411 8,060 19,392 14,940 
     Parts - Inter-segment6,790 5,629 12,680 12,415 
     Other(396)(184)(463)(301)
     Eliminations(6,790)(5,629)(12,680)(12,415)
             Net sales$143,876 $125,596 $259,664 $263,079 
  
Gross Profit
     Units$42,122 $40,794 $76,080 $86,848 
     Parts - External4,363 3,547 7,313 6,724 
     Parts - Inter-segment(192)(434)(161)(829)
     Other(4,378)(6,210)(8,129)(12,494)
     Eliminations192 434 161 829 
             Net gross profit$42,107 $38,131 $75,264 $81,078