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Commitments, Legal Proceedings and Contingencies, and Guarantees Level 4 Commitments, Legal Proceedings and Contingencies, and Guarantees (Details) (USD $)
Jun. 30, 2013
Dec. 31, 2012
Dec. 31, 2011
Purchase Commitment, Excluding Long-term Commitment [Line Items]      
Log and fiber purchase obligations   $ 227,000,000  
Utility purchase commitments   8,600,000  
Senior Notes [Member]
     
Purchase Commitment, Excluding Long-term Commitment [Line Items]      
Long-term debt (senior notes) $ 250,000,000 $ 250,000,000 $ 0
Interest rate 6.375% 6.375%