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Revenue Recognition - Disaggregated Net Sales (Details) $ in Thousands | 3 Months Ended | 9 Months Ended
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Sep. 30, 2019 USD ($) unit | Sep. 30, 2018 USD ($) unit | Sep. 30, 2019 USD ($) unit | Sep. 30, 2018 USD ($) unit
Disaggregation of Revenue [Line Items] |  |  |  |
Net Sales | $ 113,500 | $ 112,937 | $ 346,759 | $ 321,607
Rooftop Units |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net Sales | $ 78,432 | $ 86,498 | $ 255,532 | $ 244,978
Total Units | unit | 3,520,000 | 4,053,000 | 11,079,000 | 11,696,000
Condensing Units |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net Sales | $ 4,416 | $ 5,356 | $ 13,622 | $ 14,492
Total Units | unit | 418,000 | 611,000 | 1,291,000 | 1,647,000
Air Handlers |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net Sales | $ 6,523 | $ 5,686 | $ 18,150 | $ 17,479
Total Units | unit | 552,000 | 713,000 | 1,669,000 | 2,067,000
Outdoor Mechanical Rooms |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net Sales | $ 181 | $ 311 | $ 1,488 | $ 2,178
Total Units | unit | 7,000 | 8,000 | 28,000 | 35,000
Water Source Heat Pumps |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net Sales | $ 8,751 | $ 3,112 | $ 21,417 | $ 10,240
Total Units | unit | 1,311,000 | 1,162,000 | 5,977,000 | 3,780,000
Part Sales |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net Sales | $ 10,313 | $ 5,030 | $ 25,602 | $ 17,692
Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net Sales | $ 4,884 | $ 6,944 | $ 10,948 | $ 14,548
Total Units | unit | 5,808,000 | 6,547,000 | 20,044,000 | 19,225,000

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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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