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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, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Net sales and long-lived assets by geographical area                      
Net Sales $ 200,192 $ 230,974 $ 229,973 $ 199,523 $ 184,764 $ 216,139 $ 216,665 $ 176,491 $ 860,661 $ 794,059 $ 752,148
Long-Lived Assets 240,670       219,086       240,670 219,086 210,775
Wood Construction                      
Net sales and long-lived assets by geographical area                      
Net Sales                 732,414 674,274 636,003
Concrete Construction                      
Net sales and long-lived assets by geographical area                      
Net Sales                 128,247 119,481 115,921
Other                      
Net sales and long-lived assets by geographical area                      
Net Sales                 0 304 224
United States                      
Net sales and long-lived assets by geographical area                      
Net Sales                 702,071 639,443 572,112
Long-Lived Assets 192,787       171,367       192,787 171,367 158,161
Canada                      
Net sales and long-lived assets by geographical area                      
Net Sales                 38,269 36,122 40,996
Long-Lived Assets 4,473       4,275       4,473 4,275 5,195
Denmark                      
Net sales and long-lived assets by geographical area                      
Net Sales                 15,728 14,987 15,121
Long-Lived Assets 1,249       1,381       1,249 1,381 1,518
United Kingdom                      
Net sales and long-lived assets by geographical area                      
Net Sales                 20,905 22,924 24,893
Long-Lived Assets 1,183       1,357       1,183 1,357 1,377
France                      
Net sales and long-lived assets by geographical area                      
Net Sales                 33,062 31,147 37,312
Long-Lived Assets 8,349       8,621       8,349 8,621 8,145
Germany                      
Net sales and long-lived assets by geographical area                      
Net Sales                 20,751 19,974 27,202
Long-Lived Assets 12,582       13,358       12,582 13,358 15,379
Switzerland                      
Net sales and long-lived assets by geographical area                      
Net Sales                 6,549 5,538 4,960
Long-Lived Assets 8,469       9,071       8,469 9,071 9,506
Poland                      
Net sales and long-lived assets by geographical area                      
Net Sales                 6,633 6,417 7,491
Long-Lived Assets 1,830       893       1,830 893 1,071
The Netherlands                      
Net sales and long-lived assets by geographical area                      
Net Sales                 4,909 4,773 4,539
Long-Lived Assets 21       15       21 15 30
Portugal                      
Net sales and long-lived assets by geographical area                      
Net Sales                 1,286 0 0
Long-Lived Assets 1,798       0       1,798 0 0
China/Hong Kong                      
Net sales and long-lived assets by geographical area                      
Net Sales                 151 4,097 9,646
Long-Lived Assets 6,881       7,510       6,881 7,510 8,966
Australia                      
Net sales and long-lived assets by geographical area                      
Net Sales                 4,741 3,121 3,245
Long-Lived Assets 239       274       239 274 267
New Zealand                      
Net sales and long-lived assets by geographical area                      
Net Sales                 2,474 2,154 2,237
Long-Lived Assets 163       142       163 142 82
Chile                      
Net sales and long-lived assets by geographical area                      
Net Sales                 1,572 902 573
Long-Lived Assets 56       91       56 91 149
Other countries                      
Net sales and long-lived assets by geographical area                      
Net Sales                 1,560 2,460 1,821
Long-Lived Assets $ 590       $ 731       $ 590 $ 731 $ 929