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Level 4 Goodwill and Intangible Assets (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Dec. 31, 2011
Goodwill [Abstract]      
Goodwill $ 12,170 $ 12,170 $ 12,170
Intangible assets [Abstract]      
Indefinite-Lived trade names and trademarks   8,900 8,900
Building Materials Distribution [Member]
     
Goodwill [Abstract]      
Goodwill   5,593 5,593
Wood Products [Member]
     
Goodwill [Abstract]      
Goodwill   6,577 6,577
Corporate and Other [Member]
     
Goodwill [Abstract]      
Goodwill   $ 0 $ 0