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Segment Information (Details) $ in Thousands | 3 Months Ended | 6 Months Ended | 9 Months Ended
--- | --- | --- | ---
Sep. 30, 2016 USD ($) | Jun. 30, 2016 USD ($) | Mar. 31, 2016 USD ($) | Sep. 30, 2015 USD ($) | Jun. 30, 2016 USD ($) | Sep. 30, 2016 USD ($) segment | Sep. 30, 2015 USD ($)
Segment Reporting, Other Significant Reconciling Item [Line Items] |  |  |  |  |  |  |
Number of reportable segments | segment |  |  |  |  |  | 3 |
Net sales: | $ 272,734 |  |  | $ 304,994 |  | $ 776,143 | $ 758,780
Income from operations: | 67,887 | $ 68,843 | $ 54,150 | 61,396 | $ 122,993 | 190,880 | 135,430
Unallocated Corporate Expenses | (11,323) |  |  | (5,585) |  | (26,381) | (17,818)
Total income from operations | 26,363 | $ 28,416 | $ 17,601 | 23,394 | $ 46,017 | 72,380 | 43,565
Residential Products |  |  |  |  |  |  |
Segment Reporting, Other Significant Reconciling Item [Line Items] |  |  |  |  |  |  |
Net sales: | 117,957 |  |  | 126,995 |  | 338,069 | 368,459
Income from operations: | 19,407 |  |  | 15,879 |  | 52,363 | 39,922
Industrial and Infrastructure Products |  |  |  |  |  |  |
Segment Reporting, Other Significant Reconciling Item [Line Items] |  |  |  |  |  |  |
Net sales: | 73,193 |  |  | 96,636 |  | 234,590 | 292,821
Income from operations: | 1,913 |  |  | 8,083 |  | 11,429 | 15,445
Renewable Energy & Conservation |  |  |  |  |  |  |
Segment Reporting, Other Significant Reconciling Item [Line Items] |  |  |  |  |  |  |
Net sales: | 82,008 |  |  | 81,649 |  | 204,648 | 98,733
Income from operations: | 16,366 |  |  | 5,017 |  | 34,969 | 6,016
Intersegment Elimination |  |  |  |  |  |  |
Segment Reporting, Other Significant Reconciling Item [Line Items] |  |  |  |  |  |  |
Net sales: | (424) |  |  | (286) |  | (1,164) | (1,233)
Intersegment Elimination | Industrial and Infrastructure Products |  |  |  |  |  |  |
Segment Reporting, Other Significant Reconciling Item [Line Items] |  |  |  |  |  |  |
Net sales: | $ 72,769 |  |  | $ 96,350 |  | $ 233,426 | $ 291,588

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