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Summary of Significant Accounting Policies (Details 3) - USD ($)
$ in Thousands
Sep. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Property, Plant and Equipment [Line Items]      
Property, plant and equipment, gross $ 971,050   $ 771,146
Less accumulated depreciation (413,837)   (368,480)
Property and equipment, net 557,213   402,666
Land [Member]      
Property, Plant and Equipment [Line Items]      
Property, plant and equipment, gross 38,696   36,876
Buildings [Member]      
Property, Plant and Equipment [Line Items]      
Property, plant and equipment, gross 135,001   106,269
Improvements [Member]      
Property, Plant and Equipment [Line Items]      
Property, plant and equipment, gross 50,240   46,205
Mobile equipment, information technology, and office furniture [Member]      
Property, Plant and Equipment [Line Items]      
Property, plant and equipment, gross 121,101   109,702
Machinery and Equipment [Member]      
Property, Plant and Equipment [Line Items]      
Property, plant and equipment, gross 600,461   437,433
Construction in Progress [Member]      
Property, Plant and Equipment [Line Items]      
Property, plant and equipment, gross $ 25,551   $ 34,661
Georgia-Pacific Engineered Wood Products Production Facilities [Member]      
Property, Plant and Equipment [Line Items]      
Property, plant, and equipment acquired   $ 149,135