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Level 4 Net Income Per Common Share (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Jun. 30, 2013
Jun. 30, 2012
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Computation of basic and diluted net income per common share                            
Net income $ 10,412 $ 1,300 $ 23,500 $ 15,047 $ 1,700 $ (13,800) [1] $ (3,700) $ (9,900) $ (19,000) [2] $ 91,248 $ 16,715 $ 41,496 $ (46,363) $ (33,297)
Weighted average common shares outstanding during the period (for basic calculation) 43,229,000     29,700,000           40,415,000 29,700,000      
Dilutive effect of other potential common shares 4,000     0           2,000 0      
Weighted average number of common shares for diluted net income (loss) per common share 43,233,000     29,700,000           40,417,000 29,700,000      
Net income per common share - Basic $ 0.24     $ 0.51           $ 2.26 $ 0.56      
Net income per common share - Diluted $ 0.24     $ 0.51           $ 2.26 $ 0.56      
Antidilutive stock options 200,000     0           100,000 0      
[1] Included $0.9 million in noncash asset write-downs.
[2] Included $1.5 million of expense related to the closure of a laminated beam plant in Emmett, Idaho. Included $1.2 million in noncash asset write-downs.