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Defined Pension Plans (Details Textual) (USD $)
3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Pension Plans, Defined Benefit [Member]
       
Pension Expense $ 224,000 $ 159,000 $ 671,000 $ 476,000
Pension Contributions 750,000   2,250,000  
Defined Benefit Plan, Estimated Future Employer Contributions in Current Fiscal Year 750,000   750,000  
Supplemental Employee Retirement Plans, Defined Benefit [Member]
       
Pension Expense $ 1,011,000 $ 415,000 $ 2,341,000 $ 1,347,000