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Employee Benefit Plans (Details 4) (Pension Plan, USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Pension Plan
      
Prepaid pension cost (liability) as of beginning of fiscal year $ 1,232 $ 671  
Net periodic pension income (cost) for fiscal year 974 (1,876) 2,099
Actual employer contributions    2,500 2,500
Effect of curtailment    (63)  
Prepaid pension cost (liability) as of end of fiscal year $ 2,206 $ 1,232 $ 671