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Commitments, Contingent Liabilities and Other Matters (Details) (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Commitments, Contingent Liabilities and Other Matters      
Total rental expense $ 7,300,000 $ 8,300,000 $ 12,200,000
Future minimum lease payments due under non-cancellable operating leases      
2014 4,330,000    
2015 2,874,000    
2016 2,034,000    
2017 917,000    
2018 405,000    
Thereafter 227,000    
Total 10,787,000    
Minimum period for non-cancellable sub-leases 1 year    
Aggregate future minimum rentals to be received under non-cancellable sub-leases 66,500,000    
Approximate cash maintained to satisfy regulatory reserve requirements $ 96,087,000 $ 84,070,000