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Income Taxes Level 4 Income Taxes (Details) (USD $)
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Feb. 04, 2013
Income Taxes [Line Items]                
Effective income tax rate     (147.00%)   1.00%      
Income tax provision $ 6,797,000 $ 78,000 $ (54,310,000) $ 139,000 $ 307,000 $ 240,000 $ 300,000  
Statutory U.S. income tax rate 35.00%   35.00%   38.00%      
Tax basis of net assets         182,300,000 167,500,000    
Deferred tax assets               101,900,000
Income taxes paid, net of other refunds     (12,700,000) (200,000) (200,000) (300,000) (200,000)  
Wood Products [Member]
                
Income Taxes [Line Items]                
Deferred tax assets         15,400,000 13,600,000    
Capital loss carryforward         $ 16,000,000 $ 16,000,000