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Basis of Presentation (Details Textual) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, for Net Gain (Loss), before Tax $ 3,455 $ 15,417 $ 5,140 $ 22,279
Other Tax Expense (Benefit) $ 1,210 $ 5,396 $ 1,799 $ 7,798