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Employee Benefit Plans (Details 7) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Employee Pension Plans
     
Benefit Obligations in Excess of Pension Plan Assets      
Projected benefit obligation $ 95,178 $ 105,320 $ 100,656
Accumulated benefit obligation 95,178 105,320  
Fair value of plan assets 72,617 66,137 62,105
Projected benefit obligation greater than fair value of plan assets 22,561 39,183  
Accumulated benefit obligation greater than fair value of plan assets 22,561 39,183  
Defined Benefit Pension Plan
     
Benefit Obligations in Excess of Pension Plan Assets      
Projected benefit obligation 91,946 101,796  
Accumulated benefit obligation 91,946 101,796  
Fair value of plan assets 72,617 66,137  
Projected benefit obligation greater than fair value of plan assets 19,329 35,659  
Accumulated benefit obligation greater than fair value of plan assets 19,329 35,659  
Benefit Equalization Plan
     
Benefit Obligations in Excess of Pension Plan Assets      
Projected benefit obligation 3,232 3,524  
Accumulated benefit obligation 3,232 3,524  
Projected benefit obligation greater than fair value of plan assets 3,232 3,524  
Accumulated benefit obligation greater than fair value of plan assets $ 3,232 $ 3,524