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Employee Benefit Plans (Details) (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Employee Benefit Plans      
Contributions to the Plan $ 800,000 $ 760,000 $ 755,000
Stop loss per insured person 150,000    
Total deferred compensation liability 1,700,000 1,400,000  
Assets related to employee benefit plans $ 1,800,000 $ 1,400,000