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Summary of Significant Accounting Policies Level 4 Inventories (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Inventory, Net [Abstract]    
Finished goods and work in process $ 326,782 $ 267,115
Logs 38,278 37,273
Other raw materials and supplies 22,043 21,418
Inventories $ 387,103 $ 325,806