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Commitments And Contingencies (Narrative) (Details) (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Commitments And Contingencies [Abstract]      
Guarantees extend term period 1 year    
Allowance for estimated losses on commitments $ 430,000 $ 350,000  
Net rental expense 4,200,000 3,900,000 2,900,000
Level of cash balances required to maintain   $ 1,000,000  
Agreements term 3 years