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Contingencies Level 4 (Details) (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Operating Leased Assets [Line Items]      
Loss Contingency Accrual, at Carrying Value $ 17,500,000    
Operating Leases, Rent Expense 2,000,000 1,900,000 1,900,000
Operating Leases, Future Minimum Payments Due, Current 1,493,000    
Operating Leases, Future Minimum Payments, Due in Two Years 1,487,000    
Operating Leases, Future Minimum Payments, Due in Three Years 1,469,000    
Operating Leases, Future Minimum Payments, Due in Four Years 1,377,000    
Operating Leases, Future Minimum Payments, Due in Five Years 1,138,000    
Operating Leases, Future Minimum Payments, Due Thereafter 4,329,000    
Operating Leases, Future Minimum Payments Due $ 11,300,000