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Revenue Recognition (Disaggregated Net Sales) (Details) $ in Thousands | 3 Months Ended | 6 Months Ended
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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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