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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, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Net sales and long-lived assets by geographical area |  |  |  |  |  |  |  |  |  |  |
Net Sales | $ 231,681 | $ 262,476 | $ 263,002 | $ 219,866 | $ 200,192 | $ 230,974 | $ 229,973 | $ 199,523 | $ 977,025 | $ 860,661 | $ 794,059
Long-Lived Assets | 282,059 |  |  |  | 240,670 |  |  |  | 282,059 | 240,670 | 219,086
Wood Construction |  |  |  |  |  |  |  |  |  |  |
Net sales and long-lived assets by geographical area |  |  |  |  |  |  |  |  |  |  |
Net Sales |  |  |  |  |  |  |  |  | 833,200 | 732,414 | 674,274
Concrete Construction |  |  |  |  |  |  |  |  |  |  |
Net sales and long-lived assets by geographical area |  |  |  |  |  |  |  |  |  |  |
Net Sales |  |  |  |  |  |  |  |  | 143,102 | 128,247 | 119,481
Other |  |  |  |  |  |  |  |  |  |  |
Net sales and long-lived assets by geographical area |  |  |  |  |  |  |  |  |  |  |
Net Sales |  |  |  |  |  |  |  |  | 723 | 0 | 304
United States |  |  |  |  |  |  |  |  |  |  |
Net sales and long-lived assets by geographical area |  |  |  |  |  |  |  |  |  |  |
Net Sales |  |  |  |  |  |  |  |  | 758,181 | 702,071 | 639,443
Long-Lived Assets | 223,184 |  |  |  | 192,787 |  |  |  | 223,184 | 192,787 | 171,367
Canada |  |  |  |  |  |  |  |  |  |  |
Net sales and long-lived assets by geographical area |  |  |  |  |  |  |  |  |  |  |
Net Sales |  |  |  |  |  |  |  |  | 43,176 | 38,269 | 36,122
Long-Lived Assets | 4,650 |  |  |  | 4,473 |  |  |  | 4,650 | 4,473 | 4,275
United Kingdom |  |  |  |  |  |  |  |  |  |  |
Net sales and long-lived assets by geographical area |  |  |  |  |  |  |  |  |  |  |
Net Sales |  |  |  |  |  |  |  |  | 23,157 | 20,905 | 22,924
Long-Lived Assets | 1,459 |  |  |  | 1,183 |  |  |  | 1,459 | 1,183 | 1,357
Germany |  |  |  |  |  |  |  |  |  |  |
Net sales and long-lived assets by geographical area |  |  |  |  |  |  |  |  |  |  |
Net Sales |  |  |  |  |  |  |  |  | 21,821 | 20,751 | 19,974
Long-Lived Assets | 14,153 |  |  |  | 12,582 |  |  |  | 14,153 | 12,582 | 13,358
France |  |  |  |  |  |  |  |  |  |  |
Net sales and long-lived assets by geographical area |  |  |  |  |  |  |  |  |  |  |
Net Sales |  |  |  |  |  |  |  |  | 36,677 | 33,062 | 31,147
Long-Lived Assets | 9,152 |  |  |  | 8,349 |  |  |  | 9,152 | 8,349 | 8,621
Poland |  |  |  |  |  |  |  |  |  |  |
Net sales and long-lived assets by geographical area |  |  |  |  |  |  |  |  |  |  |
Net Sales |  |  |  |  |  |  |  |  | 20,409 | 6,633 | 6,417
Long-Lived Assets | 2,471 |  |  |  | 1,830 |  |  |  | 2,471 | 1,830 | 893
Sweden |  |  |  |  |  |  |  |  |  |  |
Net sales and long-lived assets by geographical area |  |  |  |  |  |  |  |  |  |  |
Net Sales |  |  |  |  |  |  |  |  | 16,421 | 0 | 0
Long-Lived Assets | 1,068 |  |  |  | 0 |  |  |  | 1,068 | 0 | 0
Denmark |  |  |  |  |  |  |  |  |  |  |
Net sales and long-lived assets by geographical area |  |  |  |  |  |  |  |  |  |  |
Net Sales |  |  |  |  |  |  |  |  | 14,723 | 15,728 | 14,987
Long-Lived Assets | 1,601 |  |  |  | 1,249 |  |  |  | 1,601 | 1,249 | 1,381
Norway |  |  |  |  |  |  |  |  |  |  |
Net sales and long-lived assets by geographical area |  |  |  |  |  |  |  |  |  |  |
Net Sales |  |  |  |  |  |  |  |  | 12,902 | 0 | 0
Long-Lived Assets | 229 |  |  |  | 0 |  |  |  | 229 | 0 | 0
Switzerland |  |  |  |  |  |  |  |  |  |  |
Net sales and long-lived assets by geographical area |  |  |  |  |  |  |  |  |  |  |
Net Sales |  |  |  |  |  |  |  |  | 5,593 | 6,549 | 5,538
Long-Lived Assets | 8,748 |  |  |  | 8,469 |  |  |  | 8,748 | 8,469 | 9,071
Australia |  |  |  |  |  |  |  |  |  |  |
Net sales and long-lived assets by geographical area |  |  |  |  |  |  |  |  |  |  |
Net Sales |  |  |  |  |  |  |  |  | 5,501 | 4,741 | 3,121
Long-Lived Assets | 268 |  |  |  | 239 |  |  |  | 268 | 239 | 274
Belgium |  |  |  |  |  |  |  |  |  |  |
Net sales and long-lived assets by geographical area |  |  |  |  |  |  |  |  |  |  |
Net Sales |  |  |  |  |  |  |  |  | 5,050 | 1,286 | 0
Long-Lived Assets | 2,065 |  |  |  | 1,798 |  |  |  | 2,065 | 1,798 | 0
The Netherlands |  |  |  |  |  |  |  |  |  |  |
Net sales and long-lived assets by geographical area |  |  |  |  |  |  |  |  |  |  |
Net Sales |  |  |  |  |  |  |  |  | 4,834 | 4,909 | 4,773
Long-Lived Assets | 110 |  |  |  | 21 |  |  |  | 110 | 21 | 15
New Zealand |  |  |  |  |  |  |  |  |  |  |
Net sales and long-lived assets by geographical area |  |  |  |  |  |  |  |  |  |  |
Net Sales |  |  |  |  |  |  |  |  | 2,604 | 2,474 | 2,154
Long-Lived Assets | 130 |  |  |  | 163 |  |  |  | 130 | 163 | 142
Chile |  |  |  |  |  |  |  |  |  |  |
Net sales and long-lived assets by geographical area |  |  |  |  |  |  |  |  |  |  |
Net Sales |  |  |  |  |  |  |  |  | 2,314 | 1,572 | 902
Long-Lived Assets | 61 |  |  |  | 56 |  |  |  | 61 | 56 | 91
Other countries |  |  |  |  |  |  |  |  |  |  |
Net sales and long-lived assets by geographical area |  |  |  |  |  |  |  |  |  |  |
Net Sales |  |  |  |  |  |  |  |  | 3,662 | 1,711 | 6,557
Long-Lived Assets | $ 12,710 |  |  |  | $ 7,471 |  |  |  | $ 12,710 | $ 7,471 | $ 8,241

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