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Summary of Significant Accounting Policies:Inventory Valuation (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Inventory, Net [Abstract]    
Finished goods and work in process $ 452,917 $ 377,266
Logs 43,195 57,229
Other raw materials and supplies 42,611 42,178
Inventories $ 538,723 $ 476,673