Revenue Recognition (Tables)

9 Months Ended

Sep. 30, 2018

Revenue from Contract with Customer [Abstract]

Schedule of Disaggregation of Revenue

Disaggregated net sales by major source:

	Three months ended   September 30,				Nine months ended   September 30,
	2018		2017		2018		2017
	(in thousands)
Rooftop Units	$	86,498	$	88,012	$	244,978	$	235,676
Condensing Units	5,356		5,230		14,492		14,662
Air Handlers	5,686		5,339		17,479		16,728
Outdoor Mechanical Rooms	311		899		2,178		2,641
Water Source Heat Pumps	3,112		3,027		10,240		6,726
Other	11,974		11,161		32,240		24,639
Net Sales	$	112,937	$	113,668	$	321,607	$	301,072

Disaggregated units sold by major source:

	Three months ended   September 30,		Nine months ended   September 30,
	2018	2017	2018	2017
Rooftop Units	4,053	4,538	11,696	12,185
Condensing Units	611	496	1,647	1,715
Air Handlers	713	593	2,067	1,916
Outdoor Mechanical Rooms	8	17	35	56
Water Source Heat Pumps	1,162	614	3,780	1,510
Total Units	6,547	6,258	19,225	17,382