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Certain Balance Sheet Components (Schedule of Inventories) (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Inventory Disclosure [Abstract]    
Logs $ 26,657 $ 37,303
Lumber, panels and veneer 30,390 27,420
Materials and supplies 12,383 11,310
Inventories gross 69,430 76,033
Less: LIFO reserve (15,228) (15,228)
Total inventories $ 54,202 $ 60,805