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Segment Information - Geographic Distribution and Net Sales by Product (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Net sales and long-lived assets by geographical area |  |  |  |  |  |  |  |  |  |  |
Net Sales | $ 241,845 | $ 284,178 | $ 308,007 | $ 244,779 | $ 231,681 | $ 262,476 | $ 263,002 | $ 219,867 | $ 1,078,809 | $ 977,025 | $ 860,661
Long-Lived Assets | 264,346 |  |  |  | 282,059 |  |  |  | 264,346 | 282,059 | 240,670
Wood construction products |  |  |  |  |  |  |  |  |  |  |
Net sales and long-lived assets by geographical area |  |  |  |  |  |  |  |  |  |  |
Net Sales |  |  |  |  |  |  |  |  | 913,202 | 833,200 | 732,414
Concrete construction products |  |  |  |  |  |  |  |  |  |  |
Net sales and long-lived assets by geographical area |  |  |  |  |  |  |  |  |  |  |
Net Sales |  |  |  |  |  |  |  |  | 165,317 | 143,102 | 128,247
Other |  |  |  |  |  |  |  |  |  |  |
Net sales and long-lived assets by geographical area |  |  |  |  |  |  |  |  |  |  |
Net Sales |  |  |  |  |  |  |  |  | 290 | 723 | 0
United States |  |  |  |  |  |  |  |  |  |  |
Net sales and long-lived assets by geographical area |  |  |  |  |  |  |  |  |  |  |
Net Sales |  |  |  |  |  |  |  |  | 860,482 | 758,181 | 702,071
Long-Lived Assets | 210,063 |  |  |  | 223,184 |  |  |  | 210,063 | 223,184 | 192,787
Canada |  |  |  |  |  |  |  |  |  |  |
Net sales and long-lived assets by geographical area |  |  |  |  |  |  |  |  |  |  |
Net Sales |  |  |  |  |  |  |  |  | 46,874 | 43,176 | 38,269
Long-Lived Assets | 4,257 |  |  |  | 4,650 |  |  |  | 4,257 | 4,650 | 4,473
United Kingdom |  |  |  |  |  |  |  |  |  |  |
Net sales and long-lived assets by geographical area |  |  |  |  |  |  |  |  |  |  |
Net Sales |  |  |  |  |  |  |  |  | 27,194 | 23,157 | 20,751
Long-Lived Assets | 1,417 |  |  |  | 1,459 |  |  |  | 1,417 | 1,459 | 1,183
Germany |  |  |  |  |  |  |  |  |  |  |
Net sales and long-lived assets by geographical area |  |  |  |  |  |  |  |  |  |  |
Net Sales |  |  |  |  |  |  |  |  | 22,950 | 21,821 | 33,062
Long-Lived Assets | 13,221 |  |  |  | 14,153 |  |  |  | 13,221 | 14,153 | 12,582
France |  |  |  |  |  |  |  |  |  |  |
Net sales and long-lived assets by geographical area |  |  |  |  |  |  |  |  |  |  |
Net Sales |  |  |  |  |  |  |  |  | 40,182 | 36,677 | 20,905
Long-Lived Assets | 7,891 |  |  |  | 9,152 |  |  |  | 7,891 | 9,152 | 8,349
Poland |  |  |  |  |  |  |  |  |  |  |
Net sales and long-lived assets by geographical area |  |  |  |  |  |  |  |  |  |  |
Net Sales |  |  |  |  |  |  |  |  | 10,200 | 20,409 | 6,633
Long-Lived Assets | 2,794 |  |  |  | 2,471 |  |  |  | 2,794 | 2,471 | 1,830
Sweden |  |  |  |  |  |  |  |  |  |  |
Net sales and long-lived assets by geographical area |  |  |  |  |  |  |  |  |  |  |
Net Sales |  |  |  |  |  |  |  |  | 15,461 | 16,421 | 0
Long-Lived Assets | 1,154 |  |  |  | 1,068 |  |  |  | 1,154 | 1,068 | 0
Denmark |  |  |  |  |  |  |  |  |  |  |
Net sales and long-lived assets by geographical area |  |  |  |  |  |  |  |  |  |  |
Net Sales |  |  |  |  |  |  |  |  | 11,682 | 14,723 | 15,728
Long-Lived Assets | 1,454 |  |  |  | 1,601 |  |  |  | 1,454 | 1,601 | 1,249
Norway |  |  |  |  |  |  |  |  |  |  |
Net sales and long-lived assets by geographical area |  |  |  |  |  |  |  |  |  |  |
Net Sales |  |  |  |  |  |  |  |  | 12,324 | 12,902 | 0
Long-Lived Assets | 0 |  |  |  | 229 |  |  |  | 0 | 229 | 0
Switzerland |  |  |  |  |  |  |  |  |  |  |
Net sales and long-lived assets by geographical area |  |  |  |  |  |  |  |  |  |  |
Net Sales |  |  |  |  |  |  |  |  | 6,939 | 5,593 | 6,549
Long-Lived Assets | 8,067 |  |  |  | 8,748 |  |  |  | 8,067 | 8,748 | 8,469
Australia |  |  |  |  |  |  |  |  |  |  |
Net sales and long-lived assets by geographical area |  |  |  |  |  |  |  |  |  |  |
Net Sales |  |  |  |  |  |  |  |  | 6,119 | 5,501 | 4,741
Long-Lived Assets | 199 |  |  |  | 268 |  |  |  | 199 | 268 | 239
Belgium |  |  |  |  |  |  |  |  |  |  |
Net sales and long-lived assets by geographical area |  |  |  |  |  |  |  |  |  |  |
Net Sales |  |  |  |  |  |  |  |  | 5,547 | 5,050 | 1,286
Long-Lived Assets | 1,961 |  |  |  | 2,065 |  |  |  | 1,961 | 2,065 | 1,798
The Netherlands |  |  |  |  |  |  |  |  |  |  |
Net sales and long-lived assets by geographical area |  |  |  |  |  |  |  |  |  |  |
Net Sales |  |  |  |  |  |  |  |  | 5,068 | 4,834 | 4,909
Long-Lived Assets | 81 |  |  |  | 110 |  |  |  | 81 | 110 | 21
New Zealand |  |  |  |  |  |  |  |  |  |  |
Net sales and long-lived assets by geographical area |  |  |  |  |  |  |  |  |  |  |
Net Sales |  |  |  |  |  |  |  |  | 3,061 | 2,604 | 2,474
Long-Lived Assets | 111 |  |  |  | 130 |  |  |  | 111 | 130 | 163
Chile |  |  |  |  |  |  |  |  |  |  |
Net sales and long-lived assets by geographical area |  |  |  |  |  |  |  |  |  |  |
Net Sales |  |  |  |  |  |  |  |  | 3,233 | 2,314 | 1,572
Long-Lived Assets | 41 |  |  |  | 61 |  |  |  | 41 | 61 | 56
Other countries |  |  |  |  |  |  |  |  |  |  |
Net sales and long-lived assets by geographical area |  |  |  |  |  |  |  |  |  |  |
Net Sales |  |  |  |  |  |  |  |  | 1,493 | 3,662 | 1,711
Long-Lived Assets | $ 11,635 |  |  |  | $ 12,710 |  |  |  | $ 11,635 | $ 12,710 | $ 7,471

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