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Revenue Recognition - Disaggregated Net Sales (Details) $ in Thousands	3 Months Ended
	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

Revenue from Contract with Customer, Including Assessed Tax, Number of Units

+ References

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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

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