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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