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Employee Benefit Plans (Details 3) (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Pension Plans, Defined Benefit [Member]
    
Amounts In AOCI [Line Items]    
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), Net Gains (Losses), before Tax $ 37,314,000 $ 30,565,000
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net Prior Service Costs (Credit) Arising During Period, Net of Tax 2,506,000 2,804,000
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax 39,820,000 33,369,000
Other Postretirement Benefit Plans, Defined Benefit [Member]
    
Amounts In AOCI [Line Items]    
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), Net Gains (Losses), before Tax 15,472,000 13,875,000
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net Prior Service Costs (Credit) Arising During Period, Net of Tax 0 0
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax $ 15,472,000 $ 13,875,000