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Revenue Recognition (Disaggregated Net Sales) (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2018 USD ($) unit	Mar. 31, 2017 USD ($) unit
Disaggregation of Revenue [Line Items]
Net Sales	$ 99,082	$ 86,078
Rooftop Units
Disaggregation of Revenue [Line Items]
Net Sales	$ 74,815	$ 66,872
Total Units | unit	3,468,000	3,474,000
Condensing Units
Disaggregation of Revenue [Line Items]
Net Sales	$ 4,281	$ 4,215
Total Units | unit	411,000	532,000
Air Handlers
Disaggregation of Revenue [Line Items]
Net Sales	$ 5,240	$ 5,133
Total Units | unit	536,000	613,000
Outdoor Mechanical Rooms
Disaggregation of Revenue [Line Items]
Net Sales	$ 973	$ 1,204
Total Units | unit	14,000	24,000
Water Source Heat Pumps
Disaggregation of Revenue [Line Items]
Net Sales	$ 4,387	$ 1,854
Total Units | unit	1,614,000	378,000
Other
Disaggregation of Revenue [Line Items]
Net Sales	$ 9,386	$ 6,800
Total Units | unit	6,043,000	5,021,000

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

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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/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 32
-Paragraph 2A
-URI http://asc.fasb.org/extlink&oid=82859839&loc=SL82860478-203043

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=82913847&loc=SL49130539-203045

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=82913847&loc=SL49130543-203045

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=82913847&loc=SL49130545-203045

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