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Segment Information (Tables) | 12 Months Ended
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Dec. 31, 2017
Segment Reporting Information, Revenue for Reportable Segment [Abstract] |
Measurements Used by Management to Assess Performance of Segments | The following table illustrates certain measurements used by management to assess the performance of the segments described above as of and for the years ended December 31 (in thousands):
| 2017 |  | 2016 |  | 2015
Net sales: |  |  |  |  |
Residential Products | $ | 466,603 |  |  | $ | 430,938 |  |  | $ | 475,653 |
Industrial and Infrastructure Products | 215,211 |  |  | 296,513 |  |  | 378,224 |
Less: Intersegment sales | (1,247 | ) |  | (1,495 | ) |  | (1,536 | )
| 213,964 |  |  | 295,018 |  |  | 376,688 |
Renewable Energy and Conservation | 306,351 |  |  | 282,025 |  |  | 188,532 |
Total consolidated net sales | $ | 986,918 |  |  | $ | 1,007,981 |  |  | $ | 1,040,873 |
Income (loss) from operations: |  |  |  |  |
Residential Products | $ | 76,893 |  |  | $ | 65,241 |  |  | $ | 46,804 |
Industrial and Infrastructure Products | 8,159 |  |  | 1,306 |  |  | 15,581 |
Renewable Energy and Conservation | 30,218 |  |  | 43,214 |  |  | 12,659 |
Unallocated corporate expenses | (22,421 | ) |  | (36,273 | ) |  | (26,312 | )
| $ | 92,849 |  |  | $ | 73,488 |  |  | $ | 48,732 |
Depreciation and Amortization |  |  |  |  |
Residential Products | $ | 9,183 |  |  | $ | 9,297 |  |  | $ | 9,967 |
Industrial and Infrastructure Products | 6,529 |  |  | 8,237 |  |  | 12,108 |
Renewable Energy and Conservation | 5,657 |  |  | 6,203 |  |  | 7,811 |
Unallocated corporate expenses | 321 |  |  | 377 |  |  | 662 |
| $ | 21,690 |  |  | $ | 24,114 |  |  | $ | 30,548 |
Total assets |  |  |  |  |
Residential Products | $ | 358,838 |  |  | $ | 331,975 |  |  | $ | 363,339 |
Industrial and Infrastructure Products | 203,455 |  |  | 225,691 |  |  | 273,987 |
Renewable Energy and Conservation | 219,806 |  |  | 207,241 |  |  | 215,211 |
Unallocated corporate assets | 209,286 |  |  | 153,338 |  |  | 37,235 |
| $ | 991,385 |  |  | $ | 918,245 |  |  | $ | 889,772 |
Capital expenditures |  |  |  |  |
Residential Products | $ | 5,236 |  |  | $ | 5,182 |  |  | $ | 3,328 |
Industrial and Infrastructure Products | 2,094 |  |  | 2,060 |  |  | 4,846 |
Renewable Energy and Conservation | 3,648 |  |  | 3,160 |  |  | 3,871 |
Unallocated corporate expenditures | 421 |  |  | 377 |  |  | 328 |
| $ | 11,399 |  |  | $ | 10,779 |  |  | $ | 12,373 |
Net Sales by Region or Origin and Long-Lived Assets by Region of Domicile | Net sales by region or origin and long-lived assets by region of domicile for the years ended and as of December 31 are as follows (in thousands):
| 2017 |  | 2016 |  | 2015
Net sales |  |  |  |  |
North America | $ | 977,942 |  |  | $ | 963,797 |  |  | $ | 968,414 |
Europe | 1,131 |  |  | 19,447 |  |  | 48,216 |
Asia | 7,845 |  |  | 24,737 |  |  | 24,243 |
Total | $ | 986,918 |  |  | $ | 1,007,981 |  |  | $ | 1,040,873 |
Long-lived assets |  |  |  |  |
North America | $ | 97,956 |  |  | $ | 108,334 |  |  | $ | 110,571 |
Europe | 3,222 |  |  | 2,900 |  |  | 11,084 |
Asia | 601 |  |  | 992 |  |  | 1,292 |
Total | $ | 101,779 |  |  | $ | 112,226 |  |  | $ | 122,947 |

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