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Revenue Recognition - Disaggregated Net Sales (Details) $ in Thousands | 3 Months Ended | 6 Months Ended
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Jun. 30, 2020 USD ($) unit | Jun. 30, 2019 USD ($) unit | Jun. 30, 2020 USD ($) unit | Jun. 30, 2019 USD ($) unit
Disaggregation of Revenue [Line Items] |  |  |  |
Net Sales | $ 125,596 | $ 119,437 | $ 263,079 | $ 233,259
Rooftop units |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net Sales | $ 99,145 | $ 88,757 | $ 209,975 | $ 177,100
Total Units | unit | 3,746,000 | 3,797,000 | 7,807,000 | 7,559,000
Condensing units |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net Sales | $ 4,505 | $ 5,156 | $ 9,003 | $ 9,206
Total Units | unit | 446,000 | 479,000 | 854,000 | 873,000
Air handlers |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net Sales | $ 6,016 | $ 6,033 | $ 12,263 | $ 11,627
Total Units | unit | 501,000 | 537,000 | 1,011,000 | 1,117,000
Outdoor mechanical rooms |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net Sales | $ 434 | $ 825 | $ 1,349 | $ 1,307
Total Units | unit | 6,000 | 10,000 | 16,000 | 21,000
Water source heat pumps |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net Sales | $ 3,796 | $ 6,822 | $ 7,499 | $ 12,666
Total Units | unit | 1,645,000 | 2,377,000 | 3,262,000 | 4,666,000
Part sales |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net Sales | $ 7,565 | $ 8,799 | $ 14,078 | $ 15,289
Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net Sales | $ 4,135 | $ 3,045 | $ 8,912 | $ 6,064
Total Units | unit | 6,344,000 | 7,200,000 | 12,950,000 | 14,236,000

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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 280 -SubTopic 10 -Section 50 -Paragraph 41 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e9038-108599 Reference 2: 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=121604090&loc=SL49130545-203045 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 32 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8933-108599 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 32 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8933-108599 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 30 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8906-108599 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8736-108599 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8736-108599 Reference 8: 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=121604090&loc=SL49130543-203045 Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 42 -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e9054-108599 Reference 10: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 40 -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e9031-108599 Reference 11: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 924 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 11.L) -URI http://asc.fasb.org/extlink&oid=6472922&loc=d3e499488-122856 + Details
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