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Employee Benefit Plans (Details 9) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Significant Other Observable Inputs (Level 2)
   
Fair value of plan assets $ 292 $ 441
Quoted Prices in Market for Identical Assets (Level 1)
   
Fair value of plan assets 36,041 29,683
Fair Value Total
   
Fair value of plan assets 36,333 30,124
Fixed income investments - Money market funds | Significant Other Observable Inputs (Level 2)
   
Fair value of plan assets 292 441
Fixed income investments - Money market funds | Fair Value Total
   
Fair value of plan assets 292 441
Fixed income investments - US government bond fund | Quoted Prices in Market for Identical Assets (Level 1)
   
Fair value of plan assets 3,257 2,995
Fixed income investments - US government bond fund | Fair Value Total
   
Fair value of plan assets 3,257 2,995
Equity investments - Company stock | Quoted Prices in Market for Identical Assets (Level 1)
   
Fair value of plan assets 1,992 1,182
Equity investments - Company stock | Fair Value Total
   
Fair value of plan assets 1,992 1,182
Fixed income investments - US corporate bond fund | Quoted Prices in Market for Identical Assets (Level 1)
   
Fair value of plan assets 3,231 3,008
Fixed income investments - US corporate bond fund | Fair Value Total
   
Fair value of plan assets 3,231 3,008
Equity investments - Foreign equity fund | Quoted Prices in Market for Identical Assets (Level 1)
   
Fair value of plan assets 3,696 3,147
Equity investments - Foreign equity fund | Fair Value Total
   
Fair value of plan assets 3,696 3,147
Fixed income investments - US corporate high yield bond fund | Quoted Prices in Market for Identical Assets (Level 1)
   
Fair value of plan assets 1,688 1,563
Fixed income investments - US corporate high yield bond fund | Fair Value Total
   
Fair value of plan assets 1,688 1,563
Equity investments - Mid cap growth fund | Quoted Prices in Market for Identical Assets (Level 1)
   
Fair value of plan assets 3,783 3,153
Equity investments - Mid cap growth fund | Fair Value Total
   
Fair value of plan assets 3,783 3,153
Equity investments - Large cap value fund | Quoted Prices in Market for Identical Assets (Level 1)
   
Fair value of plan assets 7,512 6,101
Equity investments - Large cap value fund | Fair Value Total
   
Fair value of plan assets 7,512 6,101
Equity investments - Small cap growth fund | Quoted Prices in Market for Identical Assets (Level 1)
   
Fair value of plan assets 3,142 2,514
Equity investments - Small cap growth fund | Fair Value Total
   
Fair value of plan assets 3,142 2,514
Equity investments - Large cap growth fund | Quoted Prices in Market for Identical Assets (Level 1)
   
Fair value of plan assets 7,740 6,020
Equity investments - Large cap growth fund | Fair Value Total
   
Fair value of plan assets $ 7,740 $ 6,020