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Segment Information - Disaggregation of Revenue (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Disaggregation of Revenue [Line Items] |  |  |  |
Net Sales | $ 285,814 | $ 262,655 | $ 535,253 | $ 490,072
Renewable Energy and Conservation |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net Sales | 98,259 | 76,004 | 194,756 | 144,841
Residential Products |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net Sales | 139,472 | 130,433 | 242,891 | 234,142
Industrial and Infrastructure Products |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net Sales | 48,083 | 56,218 | 97,606 | 111,089
Point in Time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net Sales | 187,883 | 184,350 | 344,297 | 339,819
Point in Time | Renewable Energy and Conservation |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net Sales | 12,416 | 8,469 | 27,004 | 15,759
Point in Time | Residential Products |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net Sales | 138,288 | 129,566 | 240,619 | 232,458
Point in Time | Industrial and Infrastructure Products |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net Sales | 37,179 | 46,315 | 76,674 | 91,602
Over Time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net Sales | 97,931 | 78,305 | 190,956 | 150,253
Over Time | Renewable Energy and Conservation |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net Sales | 85,843 | 67,535 | 167,752 | 129,082
Over Time | Residential Products |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net Sales | 1,184 | 867 | 2,272 | 1,684
Over Time | Industrial and Infrastructure Products |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net Sales | $ 10,904 | $ 9,903 | $ 20,932 | $ 19,487

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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=120311839&loc=d3e8736-108599 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=114001798&loc=d3e33918-111571 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 28 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=75031198&loc=d3e14064-108612 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 32 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8933-108599 Reference 5: 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=120311839&loc=d3e8933-108599 Reference 6: 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=120311839&loc=d3e8736-108599 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 40 -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e9031-108599 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 30 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8906-108599 Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 41 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e9038-108599 Reference 10: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 42 -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e9054-108599 Reference 11: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(g)(1)(ii)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690 Reference 12: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 235 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-05(b)(2)) -URI http://asc.fasb.org/extlink&oid=120399901&loc=d3e537907-122884 Reference 13: http://www.xbrl.org/2003/role/disclosureRef -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=120395209&loc=SL114868664-224227 + Details
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