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Sale of Deltic MDF Facility (Narrative) (Details) - USD ($)
$ in Thousands
 1 Months Ended 6 Months Ended
Feb. 12, 2019
Feb. 28, 2019
Jun. 30, 2020
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