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Segments
 9 Months Ended
Sep. 30, 2019
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 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 
 September 30,		Nine Months Ended 
 September 30,
 2019201820192018
 (in thousands)
Sales   
     Units$102,499  $104,957  $319,820  $300,623  
     Parts - External11,028  8,321  27,287  21,700  
     Parts - Inter-segment6,448  7,669  21,665  21,306  
     Other(27) (341) (348) (716) 
     Eliminations(6,448) (7,669) (21,665) (21,306) 
             Net sales$113,500  $112,937  $346,759  $321,607  
  
Gross Profit
     Units$27,713  $33,488  $84,998  $79,407  
     Parts - External5,074  3,893  13,245  9,880  
     Parts - Inter-segment44  (39) 889  325  
     Other(5,402) (4,618) (14,890) (13,549) 
     Eliminations(44) 39  (889) (325) 
             Net gross profit$27,385  $32,763  $83,353  $75,738