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Summary of Significant Accounting Policies (Details 2) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Summary of accumulated other comprehensive income (loss)      
Pension liability adjustment, net of tax benefit of $1244 and $1294 $ (2,188) $ (2,326)  
Deferred gain (loss) on cash flow derivatives, net of tax benefit of $50 and expenses of $44 (85) 14 (197)
Total $ (2,273) $ (2,312)