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Mergers and Divestitures (Narrative) (Details)
$ in Thousands
 10 Months Ended 12 Months Ended 23 Months Ended
Feb. 28, 2019
USD ($)
Nov. 15, 2018
shares
Feb. 20, 2018
USD ($)
a
Sawmill
shares
Feb. 19, 2018
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2020
USD ($)
shares
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
shares
Dec. 31, 2020
USD ($)
Business Acquisition [Line Items]                  
Merger-related costs [1]               $ 22,119  
Qualifying terminations, share-based payments               1,812  
Revenue           $ 1,040,930 $ 827,098 974,579  
Income before taxes           193,953 56,671 142,079  
Pre-tax gain on sale of facility             9,176    
Total cash proceeds received after working capital adjustments, closing costs and other expenses           1,000 $ 58,793    
Roseburg Forest Products Co [Member] | Deltic MDF Facility [Member]                  
Business Acquisition [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                
Total cash proceeds received after working capital adjustments, closing costs and other expenses           $ 1,000     $ 59,800
Deltic [Member]                  
Business Acquisition [Line Items]                  
Acres of timberland | a     530,000            
Number of sawmills | Sawmill     2            
Total assets acquired     $ 1,400,000            
Equity consideration transferred     1,100,000            
Liabilities assumed     $ 300,000            
Merger-related costs               22,100  
Merger related costs, professional fees               12,200  
Restructuring costs, termination benefits               9,900  
Revenue         $ 265,500        
Income before taxes         $ 21,600        
Non-recurring merger-related costs       $ 5,500       27,600  
Number of shares issued upon merger | shares     22,000,000.0            
Deltic [Member] | Special Distribution [Member]                  
Business Acquisition [Line Items]                  
Number of shares issued upon merger | shares   4,800,000              
Business combination, estimated shares settle in non cash amount of liability | shares           4,800,000      
Deltic [Member] | Replacement Restricted Stock Unit Awards [Member]                  
Business Acquisition [Line Items]                  
Qualifying terminations, share-based payments               $ 1,800  
Qualifying terminations, accelerated shares | shares               35,000  
[1] See Note 2: Mergers and Divestitures.