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Commitments and Contingent Liabilities (Details) (USD $)
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Operating leases with minimum rental commitments [Abstract]      
2014 $ 6,860,000    
2015 6,493,000    
2016 6,295,000    
2017 5,979,000    
2018 5,719,000    
2019 and after 42,429,000    
Total 73,775,000    
Outsourced service expense 5,125,000 5,122,000 5,100,000
Contractual Obligation [Abstract]      
Outsource Service expense, minimum payment 5,000,000    
Outsource Service expense, maximum payment $ 6,000,000