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Employees' Profit Sharing Plan (Details) (Deferred profit sharing plan, USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Deferred profit sharing plan
      
Employees' profit sharing plan      
Minimum period of continuous employment to be fully vested P1Y    
Profit sharing costs $ 3,500,000 $ 3,400,000 $ 3,900,000