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Revenue Recognition | 12 Months Ended
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Dec. 31, 2018
Revenue from Contract with Customer [Abstract] |
Revenue Recognition | Revenue Recognition Disaggregated net sales by major source:
| Years Ending December 31,
| 2018 |  | 2017 |  | 2016
| (in thousands)
Rooftop Units | $ | 333,105 |  |  | $ | 317,414 |  |  | $ | 309,641 |
Condensing Units | 18,282 |  |  | 19,276 |  |  | 13,987 |
Air Handlers | 21,905 |  |  | 22,570 |  |  | 19,792 |
Outdoor Mechanical Rooms | 2,408 |  |  | 3,238 |  |  | 4,515 |
Water Source Heat Pumps | 14,660 |  |  | 9,911 |  |  | 5,835 |
Part Sales | 26,732 |  |  | 20,756 |  |  | 20,374 |
Other | 16,855 |  |  | 12,067 |  |  | 9,833 |
Net Sales | $ | 433,947 |  |  | $ | 405,232 |  |  | $ | 383,977 |
Other sales include freight, extended warranties and miscellaneous revenue. Disaggregated units sold by major source:
| Years Ending December 31,
| 2018 |  | 2017 |  | 2016
Rooftop Units | 15,273 |  |  | 16,003 |  |  | 16,764 |
Condensing Units | 2,007 |  |  | 2,252 |  |  | 1,639 |
Air Handlers | 2,500 |  |  | 2,577 |  |  | 2,114 |
Outdoor Mechanical Rooms | 38 |  |  | 64 |  |  | 65 |
Water Source Heat Pumps | 5,334 |  |  | 2,485 |  |  | 316 |
Total Units | 25,152 |  |  | 23,381 |  |  | 20,898 |

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- Definition The entire disclosure of revenue from contract with customer to transfer good or service and to transfer nonfinancial asset. Includes, but is not limited to, disaggregation of revenue, credit loss recognized from contract with customer, judgment and change in judgment related to contract with customer, and asset recognized from cost incurred to obtain or fulfill contract with customer. Excludes insurance and lease contracts. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -URI http://asc.fasb.org/topic&trid=49130388 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -URI http://asc.fasb.org/topic&trid=2122369 + Details
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