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Summary of Significant Accounting Policies:Inventory Valuation (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Inventory, Net [Abstract]    
Finished goods and work in process $ 377,266 $ 330,026
Logs 57,229 63,208
Other raw materials and supplies 42,178 40,217
Inventories $ 476,673 $ 433,451