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Commitments and Contingent Liabilities (Details) (USD $)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Operating leases with minimum rental commitments [Abstract]      
2013 $ 6,584,000    
2014 6,523,000    
2015 6,156,000    
2016 5,961,000    
2017 5,635,000    
2018 and after 43,612,000    
Total 74,471,000    
Outsourced service expense 5,122,000 5,100,000 5,458,000
Contractual Obligation [Abstract]      
Outsource Service expense, minimum payment 5,000,000    
Outsource Service expense, maximum payment $ 6,000,000