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Revenue Recognition (Disaggregated Net Sales) (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018 USD ($) unit	Jun. 30, 2017 USD ($) unit	Jun. 30, 2018 USD ($) unit	Jun. 30, 2017 USD ($) unit
Disaggregation of Revenue [Line Items]
Net Sales	$ 109,588	$ 101,326	$ 208,670	$ 187,404
Rooftop Units
Disaggregation of Revenue [Line Items]
Net Sales	$ 83,665	$ 80,792	$ 158,480	$ 147,664
Total Units | unit	4,175,000	4,173,000	7,643,000	7,647,000
Condensing Units
Disaggregation of Revenue [Line Items]
Net Sales	$ 4,855	$ 5,217	$ 9,136	$ 9,432
Total Units | unit	625,000	687,000	1,036,000	1,219,000
Air Handlers
Disaggregation of Revenue [Line Items]
Net Sales	$ 6,553	$ 6,256	$ 11,793	$ 11,389
Total Units | unit	818,000	710,000	1,354,000	1,323,000
Outdoor Mechanical Rooms
Disaggregation of Revenue [Line Items]
Net Sales	$ 894	$ 538	$ 1,867	$ 1,742
Total Units | unit	13,000	15,000	27,000	39,000
Water Source Heat Pumps
Disaggregation of Revenue [Line Items]
Net Sales	$ 2,741	$ 1,845	$ 7,128	$ 3,699
Total Units | unit	1,004,000	518,000	2,618,000	896,000
Other
Disaggregation of Revenue [Line Items]
Net Sales	$ 10,880	$ 6,678	$ 20,266	$ 13,478
Total Units | unit	6,635,000	6,103,000	12,678,000	11,124,000

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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://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130539-203045

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
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-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130545-203045

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130543-203045

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