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Revenue Recognition (Disaggregated Net Sales) (Details) $ in Thousands | 3 Months Ended | 9 Months Ended
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Sep. 30, 2018 USD ($) unit | Sep. 30, 2017 USD ($) unit | Sep. 30, 2018 USD ($) unit | Sep. 30, 2017 USD ($) unit
Disaggregation of Revenue [Line Items] |  |  |  |
Net Sales | $ 112,937 | $ 113,668 | $ 321,607 | $ 301,072
Rooftop Units |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net Sales | $ 86,498 | $ 88,012 | $ 244,978 | $ 235,676
Total Units | unit | 4,053,000 | 4,538,000 | 11,696,000 | 12,185,000
Condensing Units |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net Sales | $ 5,356 | $ 5,230 | $ 14,492 | $ 14,662
Total Units | unit | 611,000 | 496,000 | 1,647,000 | 1,715,000
Air Handlers |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net Sales | $ 5,686 | $ 5,339 | $ 17,479 | $ 16,728
Total Units | unit | 713,000 | 593,000 | 2,067,000 | 1,916,000
Outdoor Mechanical Rooms |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net Sales | $ 311 | $ 899 | $ 2,178 | $ 2,641
Total Units | unit | 8,000 | 17,000 | 35,000 | 56,000
Water Source Heat Pumps |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net Sales | $ 3,112 | $ 3,027 | $ 10,240 | $ 6,726
Total Units | unit | 1,162,000 | 614,000 | 3,780,000 | 1,510,000
Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net Sales | $ 11,974 | $ 11,161 | $ 32,240 | $ 24,639
Total Units | unit | 6,547,000 | 6,258,000 | 19,225,000 | 17,382,000

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