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Asset Retirement Obligations Changes to Asset Retirement Obligation (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Asset Retirement Obligation [Line Items]    
Asset retirement obligation at beginning of period $ 5,145 $ 5,095
Acquisition   0
Liabilities incurred 3,164 0
Accretion expense 275 50
Revisions in estimated cash flows (378) 0
Asset retirement obligation at end of period 32,047 5,145
Boise Inc.
   
Asset Retirement Obligation [Line Items]    
Acquisition $ 23,841