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Employee Benefit Plans (Details 5) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Fair value of the pension plan assets by asset category      
Total $ 11,707 $ 10,034 $ 9,296
Pension plans, defined benefit [Member]
     
Fair value of the pension plan assets by asset category      
Total 11,707 10,034  
Pension plans, defined benefit [Member] | Cash equivalents [Member]
     
Fair value of the pension plan assets by asset category      
Total 485 1,791  
Pension plans, defined benefit [Member] | U.S. large-cap (a) [Member]
     
Fair value of the pension plan assets by asset category      
Total 4,335 3,821  
Pension plans, defined benefit [Member] | U.S. mid-cap (b) [Member]
     
Fair value of the pension plan assets by asset category      
Total 575 502  
Pension plans, defined benefit [Member] | U.S. small-cap (c) [Member]
     
Fair value of the pension plan assets by asset category      
Total 635 595  
Pension plans, defined benefit [Member] | International (d) [Member]
     
Fair value of the pension plan assets by asset category      
Total 1,670 1,278  
Pension plans, defined benefit [Member] | Real estate (e) [Member]
     
Fair value of the pension plan assets by asset category      
Total 395 203  
Pension plans, defined benefit [Member] | Commodities (f) [Member]
     
Fair value of the pension plan assets by asset category      
Total 370 198  
Pension plans, defined benefit [Member] | U.S. gov't agency obligations (g) [Member]
     
Fair value of the pension plan assets by asset category      
Total 2,726 841  
Pension plans, defined benefit [Member] | Corporate investment grade (g) [Member]
     
Fair value of the pension plan assets by asset category      
Total 416 653  
Pension plans, defined benefit [Member] | Corporate non-investment grade (g) [Member]
     
Fair value of the pension plan assets by asset category      
Total 100 152  
Pension plans, defined benefit [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
     
Fair value of the pension plan assets by asset category      
Total 8,465 8,388  
Pension plans, defined benefit [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Cash equivalents [Member]
     
Fair value of the pension plan assets by asset category      
Total 485 1,791  
Pension plans, defined benefit [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | U.S. large-cap (a) [Member]
     
Fair value of the pension plan assets by asset category      
Total 4,335 3,821  
Pension plans, defined benefit [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | U.S. mid-cap (b) [Member]
     
Fair value of the pension plan assets by asset category      
Total 575 502  
Pension plans, defined benefit [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | U.S. small-cap (c) [Member]
     
Fair value of the pension plan assets by asset category      
Total 635 595  
Pension plans, defined benefit [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | International (d) [Member]
     
Fair value of the pension plan assets by asset category      
Total 1,670 1,278  
Pension plans, defined benefit [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Real estate (e) [Member]
     
Fair value of the pension plan assets by asset category      
Total 395 203  
Pension plans, defined benefit [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Commodities (f) [Member]
     
Fair value of the pension plan assets by asset category      
Total 370 198  
Pension plans, defined benefit [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | U.S. gov't agency obligations (g) [Member]
     
Fair value of the pension plan assets by asset category      
Total 0 0  
Pension plans, defined benefit [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Corporate investment grade (g) [Member]
     
Fair value of the pension plan assets by asset category      
Total 0 0  
Pension plans, defined benefit [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Corporate non-investment grade (g) [Member]
     
Fair value of the pension plan assets by asset category      
Total 0 0  
Pension plans, defined benefit [Member] | Other Observable Inputs (Level 2) [Member]
     
Fair value of the pension plan assets by asset category      
Total 3,242 1,646  
Pension plans, defined benefit [Member] | Other Observable Inputs (Level 2) [Member] | Cash equivalents [Member]
     
Fair value of the pension plan assets by asset category      
Total 0 0  
Pension plans, defined benefit [Member] | Other Observable Inputs (Level 2) [Member] | U.S. large-cap (a) [Member]
     
Fair value of the pension plan assets by asset category      
Total 0 0  
Pension plans, defined benefit [Member] | Other Observable Inputs (Level 2) [Member] | U.S. mid-cap (b) [Member]
     
Fair value of the pension plan assets by asset category      
Total 0 0  
Pension plans, defined benefit [Member] | Other Observable Inputs (Level 2) [Member] | U.S. small-cap (c) [Member]
     
Fair value of the pension plan assets by asset category      
Total 0 0  
Pension plans, defined benefit [Member] | Other Observable Inputs (Level 2) [Member] | International (d) [Member]
     
Fair value of the pension plan assets by asset category      
Total 0 0  
Pension plans, defined benefit [Member] | Other Observable Inputs (Level 2) [Member] | Real estate (e) [Member]
     
Fair value of the pension plan assets by asset category      
Total 0 0  
Pension plans, defined benefit [Member] | Other Observable Inputs (Level 2) [Member] | Commodities (f) [Member]
     
Fair value of the pension plan assets by asset category      
Total 0 0  
Pension plans, defined benefit [Member] | Other Observable Inputs (Level 2) [Member] | U.S. gov't agency obligations (g) [Member]
     
Fair value of the pension plan assets by asset category      
Total 2,726 841  
Pension plans, defined benefit [Member] | Other Observable Inputs (Level 2) [Member] | Corporate investment grade (g) [Member]
     
Fair value of the pension plan assets by asset category      
Total 416 653  
Pension plans, defined benefit [Member] | Other Observable Inputs (Level 2) [Member] | Corporate non-investment grade (g) [Member]
     
Fair value of the pension plan assets by asset category      
Total 100 152  
Pension plans, defined benefit [Member] | Significant Unobservable Inputs (Level 3) [Member]
     
Fair value of the pension plan assets by asset category      
Total 0 0  
Pension plans, defined benefit [Member] | Significant Unobservable Inputs (Level 3) [Member] | Cash equivalents [Member]
     
Fair value of the pension plan assets by asset category      
Total 0 0  
Pension plans, defined benefit [Member] | Significant Unobservable Inputs (Level 3) [Member] | U.S. large-cap (a) [Member]
     
Fair value of the pension plan assets by asset category      
Total 0 0  
Pension plans, defined benefit [Member] | Significant Unobservable Inputs (Level 3) [Member] | U.S. mid-cap (b) [Member]
     
Fair value of the pension plan assets by asset category      
Total 0 0  
Pension plans, defined benefit [Member] | Significant Unobservable Inputs (Level 3) [Member] | U.S. small-cap (c) [Member]
     
Fair value of the pension plan assets by asset category      
Total 0 0  
Pension plans, defined benefit [Member] | Significant Unobservable Inputs (Level 3) [Member] | International (d) [Member]
     
Fair value of the pension plan assets by asset category      
Total 0 0  
Pension plans, defined benefit [Member] | Significant Unobservable Inputs (Level 3) [Member] | Real estate (e) [Member]
     
Fair value of the pension plan assets by asset category      
Total 0 0  
Pension plans, defined benefit [Member] | Significant Unobservable Inputs (Level 3) [Member] | Commodities (f) [Member]
     
Fair value of the pension plan assets by asset category      
Total 0 0  
Pension plans, defined benefit [Member] | Significant Unobservable Inputs (Level 3) [Member] | U.S. gov't agency obligations (g) [Member]
     
Fair value of the pension plan assets by asset category      
Total 0 0  
Pension plans, defined benefit [Member] | Significant Unobservable Inputs (Level 3) [Member] | Corporate investment grade (g) [Member]
     
Fair value of the pension plan assets by asset category      
Total 0 0  
Pension plans, defined benefit [Member] | Significant Unobservable Inputs (Level 3) [Member] | Corporate non-investment grade (g) [Member]
     
Fair value of the pension plan assets by asset category      
Total $ 0 $ 0