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Certain Balance Sheet Components (Schedule of Inventories) (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Inventory Disclosure [Abstract]    
Logs $ 34,980 $ 31,210
Lumber, panels and veneer 35,716 34,136
Materials and supplies 17,415 14,939
Inventories gross 88,111 80,285
Less: LIFO reserve (18,249) (18,249)
Total inventories $ 69,862 $ 62,036