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Employee Benefit Plans (Details 7) (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Pension Plans, Defined Benefit [Member]
      
Defined Benefit Plan, Amounts Recognized in Other Comprehensive Income (Loss) [Abstract]      
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net Unamortized Gain (Loss) Arising During Period, before Tax $ 10,888,000 $ 18,561,000 $ (3,743,000)
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net Prior Service Cost (Credit) Arising During Period, before Tax 0 0 0
Other Comprehensive Income (Loss), Reclassification, Pension and Other Postretirement Benefit Plans, Net Gain (Loss) Recognized in Net Periodic Benefit Cost, before Tax (3,439,000) (980,000) (688,000)
Other Comprehensive Income (Loss), Amortization, Pension and Other Postretirement Benefit Plans, Net Prior Service Cost (Credit) Recognized in Net Periodic Benefit Cost, before Tax (376,000) (399,000) 171,000
OtherComprehensiveIncomeFinalizationOfPensionAndNonPensionPostretirementPlanValuationBeforeTax (841,000) 0 0
Other Comprehensive Income Defined Benefit Plan Net Foreign Exchange Translations And Other Adjustments 219,000 (196,000) (307,000)
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Adjustment, before Tax 6,451,000 16,986,000 (4,567,000)
Total recognized in net periodic benefit cost and other comprehensive income 19,644,000 25,329,000 1,555,000
Other Postretirement Benefit Plans, Defined Benefit [Member]
      
Defined Benefit Plan, Amounts Recognized in Other Comprehensive Income (Loss) [Abstract]      
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net Unamortized Gain (Loss) Arising During Period, before Tax 2,341,000 8,348,000 2,326,000
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net Prior Service Cost (Credit) Arising During Period, before Tax 0 0 0
Other Comprehensive Income (Loss), Reclassification, Pension and Other Postretirement Benefit Plans, Net Gain (Loss) Recognized in Net Periodic Benefit Cost, before Tax (743,000) (353,000) (236,000)
Other Comprehensive Income (Loss), Amortization, Pension and Other Postretirement Benefit Plans, Net Prior Service Cost (Credit) Recognized in Net Periodic Benefit Cost, before Tax 0 0 0
OtherComprehensiveIncomeFinalizationOfPensionAndNonPensionPostretirementPlanValuationBeforeTax 0 0 0
Other Comprehensive Income Defined Benefit Plan Net Foreign Exchange Translations And Other Adjustments 0 0 0
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Adjustment, before Tax 1,598,000 7,995,000 2,090,000
Total recognized in net periodic benefit cost and other comprehensive income $ 5,228,000 $ 10,499,000 $ 4,055,000