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Segments (Tables) | 12 Months Ended
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Dec. 31, 2018
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 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 |

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- Definition Tabular disclosure of the profit or loss and total assets for each reportable segment. An entity discloses certain information on each reportable segment if the amounts (a) are included in the measure of segment profit or loss reviewed by the chief operating decision maker or (b) are otherwise regularly provided to the chief operating decision maker, even if not included in that measure of segment profit or loss. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 25 -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8813-108599 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=108376223&loc=d3e13816-109267 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8721-108599 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 30 -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8906-108599 + Details
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