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Investments in Unconsolidated Affiliates (Details 1) (USD $)
In Thousands, unless otherwise specified
 9 Months Ended 12 Months Ended
Sep. 30, 2012
Dec. 31, 2011
Summary of activity in income from unconsolidated affiliates    
Income from unconsolidated affiliates $ 958 $ (244)
Elimination of intercompany revenue 1,202  
Income from unconsolidated affiliates $ 958 $ (244)