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Segment Information (Details 2) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Dec. 31, 2015
Net sales and long-lived assets by geographical area            
Cash and cash equivalents $ 204,171 $ 218,720 $ 204,171 $ 218,720 $ 226,537 $ 258,825
Net sales 262,476 230,974 745,345 660,470    
Wood construction products            
Net sales and long-lived assets by geographical area            
Net sales 224,317 193,513 639,207 562,025    
Concrete construction products            
Net sales and long-lived assets by geographical area            
Net sales 38,051 37,461 105,785 98,445    
Other            
Net sales and long-lived assets by geographical area            
Net sales 108 0 353 0    
Corporate, Non-Segment [Member]            
Net sales and long-lived assets by geographical area            
Cash and cash equivalents $ 116,000 $ 128,600 $ 116,000 $ 128,600 $ 137,400