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Segment Information (Tables) | 12 Months Ended
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Dec. 31, 2018
Segment Information |
Summary of the annual percentage of net sales by product category. |
|  | 2018 |  |  | 2017 |  |  | 2016 |
Insulation |  | 71 | % |  | 72 | % |  | 71 | %
Rain gutters |  | 6 |  |  | 7 |  |  | 7 |
Accessories |  | 4 |  |  | 5 |  |  | 5 |
Afterpaint (shower enclosures, closet shelving, bath accessories, etc.) |  | 4 |  |  | 3 |  |  | 2 |
Glass and windows |  | 3 |  |  | 1 |  |  | 1 |
All other |  | 12 |  |  | 12 |  |  | 14 |
|  | 100 | % |  | 100 | % |  | 100 | %
Schedule of net sales and operating results by segment | Key information by segment is as follows, for the years ended December 31, in thousands:
|  | Net Sales |  | Operating Profit (b)
|  |  | 2018 |  |  | 2017 |  |  | 2016 |  |  | 2018 |  |  | 2017 |  |  | 2016
Our operations by segment were (a): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Installation (exclusive of significant legal settlement, shown separately below) |  | $ | 1,680,967 |  | $ | 1,281,296 |  | $ | 1,150,168 |  | $ | 196,986 |  | $ | 139,316 |  | $ | 97,140
Significant legal settlement (Installation segment) (c) |  |  | — |  |  | — |  |  | — |  |  | — |  |  | (30,000) |  |  | —
Distribution |  |  | 820,309 |  |  | 719,759 |  |  | 676,672 |  |  | 78,739 |  |  | 68,733 |  |  | 59,654
Intercompany eliminations and other adjustments |  |  | (117,027) |  |  | (94,789) |  |  | (83,990) |  |  | (20,899) |  |  | (16,463) |  |  | (14,388)
Total |  | $ | 2,384,249 |  | $ | 1,906,266 |  | $ | 1,742,850 |  |  | 254,826 |  |  | 161,586 |  |  | 142,406
General corporate expense, net (d) |  |  |  |  |  |  |  |  |  |  |  | (45,873) |  |  | (24,722) |  |  | (20,802)
Operating profit, as reported |  |  |  |  |  |  |  |  |  |  |  | 208,953 |  |  | 136,864 |  |  | 121,604
Other expense, net |  |  |  |  |  |  |  |  |  |  |  | (28,129) |  |  | (8,824) |  |  | (5,331)
Income before income taxes |  |  |  |  |  |  |  |  |  |  | $ | 180,824 |  | $ | 128,040 |  | $ | 116,273
|  | Property Additions |  | Depreciation and Amortization |  | Total Assets
|  | 2018 |  | 2017 |  | 2016 |  | 2018 |  | 2017 |  | 2016 |  | 2018 |  | 2017
Our operations by segment were (a): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Installation |  | $ | 69,497 |  | $ | 21,956 |  | $ | 7,584 |  | $ | 31,661 |  | $ | 12,208 |  | $ | 8,149 |  | $ | 1,618,032 |  | $ | 1,061,418
Distribution |  |  | 11,121 |  |  | 5,845 |  |  | 3,348 |  |  | 6,616 |  |  | 3,561 |  |  | 3,604 |  |  | 698,337 |  |  | 599,503
Corporate |  |  | 6,796 |  |  | 1,620 |  |  | 3,433 |  |  | 1,142 |  |  | 684 |  |  | 258 |  |  | 138,162 |  |  | 88,628
Total, as reported |  | $ | 87,414 |  | $ | 29,421 |  | $ | 14,365 |  | $ | 39,419 |  | $ | 16,453 |  | $ | 12,011 |  | $ | 2,454,531 |  | $ | 1,749,549
(a) | All of our operations are located in the U.S.
(b) | Segment operating profit includes an allocation of general corporate expenses attributable to the operating segments which is based on direct benefit or usage (such as salaries of corporate employees who directly support the segment).
(c) | Significant legal settlement expense of $30 million incurred for the year ended December 31, 2017, related to the settlement agreement with Owens Corning. For more information see Note 10 – Other Commitments and Contingencies.
(d) | General corporate expense, net includes expenses not specifically attributable to our segments for functions such as corporate human resources, finance, and legal, including salaries, benefits, and other related costs.

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