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Commitments and Contingent Liabilities and Other Matters (Details) - USD ($)
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Commitments, Contingent Liabilities and Other Matters      
Total rental expense $ 5,258,000 $ 5,870,000 $ 6,200,000
Minimum period for non-cancellable sub-leases 1 year    
Aggregate future minimum rentals to be received under non-cancellable sub-leases $ 92,416,000    
Approximate cash maintained to satisfy regulatory reserve requirements 116,129,000 $ 111,353,000  
Future minimum lease payments due under non-cancellable operating leases      
2018 3,563,000    
2019 3,376,000    
2020 3,087,000    
2021 2,037,000    
2022 494,000    
Thereafter 180,000    
Total $ 12,737,000