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Credit Risk (Changes in the Allowance for Doubtful Accounts) (Details) (USD $)
In Thousands, unless otherwise specified
6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Allowance for Doubtful Accounts Receivable [Roll Forward]    
Balance at beginning of period $ 1,733  
Charged to expense 250 14
Write-offs (3)  
Foreign currency translation adjustment (21)  
Balance at end of period $ 1,959