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Basis of Presentation (Details Textual) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, for Net Gain (Loss), before Tax $ 3,512 $ (1,407) $ 8,652 $ 20,872
Other Tax Expense (Benefit) $ 1,229 $ (492) $ 3,028 $ 7,306