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Employee Benefit Plans (Details 8) (USD $)
Dec. 31, 2012
Pension Plans, Defined Benefit [Member]
  
Defined Benefit Plan, Estimated Future Benefit Payments [Abstract]  
Defined Benefit Plan, Expected Future Benefit Payments in Year One $ 4,971,000
Defined Benefit Plan, Expected Future Benefit Payments in Year Two 5,320,000
Defined Benefit Plan, Expected Future Benefit Payments in Year Three 5,547,000
Defined Benefit Plan, Expected Future Benefit Payments in Year Four 8,297,000
Defined Benefit Plan, Expected Future Benefit Payments in Year Five 7,167,000
Defined Benefit Plan, Expected Future Benefit Payments in Five Fiscal Years Thereafter 45,270,000
Other Postretirement Benefit Plans, Defined Benefit [Member]
  
Defined Benefit Plan, Estimated Future Benefit Payments [Abstract]  
Defined Benefit Plan, Expected Future Benefit Payments in Year One 350,000
Defined Benefit Plan, Expected Future Benefit Payments in Year Two 438,000
Defined Benefit Plan, Expected Future Benefit Payments in Year Three 505,000
Defined Benefit Plan, Expected Future Benefit Payments in Year Four 584,000
Defined Benefit Plan, Expected Future Benefit Payments in Year Five 666,000
Defined Benefit Plan, Expected Future Benefit Payments in Five Fiscal Years Thereafter $ 4,812,000