Segments (Tables)

12 Months Ended

Dec. 31, 2020

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 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 Ended December 31,
	2020		2019		2018
	(in thousands)
Sales
Units	$	480,629	$	434,283	$	406,331
Parts - External	34,577		35,424		28,456
Parts - Inter-segment	24,236		28,053		29,385
Other	(655)		(374)		(840)
Eliminations	(24,236)		(28,053)		(29,385)
Net sales	$	514,551	$	469,333	$	433,947
Gross Profit
Units	$	164,048	$	121,878	$	108,214
Parts - External	15,592		17,301		13,215
Parts - Inter-segment	(1,461)		985		865
Other	(23,791)		(19,754)		(17,896)
Eliminations	1,461		(985)		(865)
Gross profit	$	155,849	$	119,425	$	103,533