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Sale of Deltic MDF Facility (Narrative) (Details) - USD ($)
$ in Thousands
 1 Months Ended 9 Months Ended
Feb. 12, 2019
Feb. 28, 2019
Sep. 30, 2020
Sep. 30, 2019
Jun. 30, 2019
Dec. 20, 2018
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]            
Pre-tax gain on sale of facility       $ 9,176    
Deltic MDF Facility [Member]            
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]            
Reduction to deferred tax liabilities       (15,800)    
Increase to income taxes payable       $ 15,800    
Roseburg Forest Products Co [Member] | Deltic MDF Facility [Member]            
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]            
Total sale price           $ 92,000
Cash sale price           63,000
Assumption sale price of revenue bonds           $ 29,000
Pre-tax gain on sale of facility $ 9,200          
Net proceeds received after closing costs and other expenses   $ 60,000        
Post-closing working capital adjustments         $ 1,200  
Reduction to deferred tax liabilities     $ (15,800)      
Increase to income taxes payable     $ 15,800