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Segment Information - Disaggregation of Revenue (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales: | $ 280,086 | $ 274,574 | $ 761,459 | $ 728,806
Residential Products |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales: | 125,839 | 129,501 | 360,915 | 361,304
Industrial and Infrastructure Products |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales: | 55,761 | 56,938 | 171,357 | 164,812
Renewable Energy & Conservation |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales: | 98,486 | 88,135 | 229,187 | 202,690
Point in Time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales: | 183,588 | 194,098 | 529,745 | 544,951
Point in Time | Residential Products |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales: | 125,118 | 129,501 | 358,960 | 361,304
Point in Time | Industrial and Infrastructure Products |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales: | 47,686 | 56,938 | 145,657 | 164,812
Point in Time | Renewable Energy & Conservation |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales: | 10,784 | 7,659 | 25,128 | 18,835
Over Time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales: | 96,498 | 80,476 | 231,714 | 183,855
Over Time | Residential Products |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales: | 721 | 0 | 1,955 | 0
Over Time | Industrial and Infrastructure Products |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales: | 8,075 | 0 | 25,700 | 0
Over Time | Renewable Energy & Conservation |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales: | $ 87,702 | $ 80,476 | $ 204,059 | $ 183,855

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- Definition Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=115205541&loc=SL114868664-224227 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 32 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8933-108599 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599 + Details
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