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Liquidity (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2012
Dec. 31, 2011
Jun. 30, 2011
Dec. 31, 2010
Liquidity        
Cash and cash equivalents $ 19,070 $ 25,387 $ 35,354 $ 51,964
Long-term debt 77,000 77,000    
Asset-based loan | Loans payable
       
Liquidity        
Total borrowing availability 29,742      
Unused borrowing capicity before additional capicity subject to cash dominion and weekly reporting covenants $ 22,742