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Revenue Recognition - Disaggregated Net Sales (Details) $ in Thousands | 3 Months Ended
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Mar. 31, 2020 USD ($) unit | Mar. 31, 2019 USD ($) unit
Disaggregation of Revenue [Line Items] |  |
Net Sales | $ 137,483 | $ 113,822
Rooftop Units |  |
Disaggregation of Revenue [Line Items] |  |
Net Sales | $ 110,830 | $ 88,343
Total Units | unit | 4,061,000 | 3,762,000
Condensing Units |  |
Disaggregation of Revenue [Line Items] |  |
Net Sales | $ 4,498 | $ 4,050
Total Units | unit | 408,000 | 394,000
Air Handlers |  |
Disaggregation of Revenue [Line Items] |  |
Net Sales | $ 6,247 | $ 5,594
Total Units | unit | 510,000 | 580,000
Outdoor Mechanical Rooms |  |
Disaggregation of Revenue [Line Items] |  |
Net Sales | $ 915 | $ 482
Total Units | unit | 10,000 | 11,000
Water Source Heat Pumps |  |
Disaggregation of Revenue [Line Items] |  |
Net Sales | $ 3,703 | $ 5,844
Total Units | unit | 1,617,000 | 2,289,000
Part Sales |  |
Disaggregation of Revenue [Line Items] |  |
Net Sales | $ 6,513 | $ 6,490
Other |  |
Disaggregation of Revenue [Line Items] |  |
Net Sales | $ 4,777 | $ 3,019
Total Units | unit | 6,606,000 | 7,036,000

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- Definition Amount, including tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value-added and excise. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045 + Details
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