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Financial Instruments (Tables)
 3 Months Ended
Mar. 31, 2013
Fair Value Disclosures [Abstract]  
Allowance for Credit Losses on Financing Receivables
The following table sets forth a summary of changes in the allowance for credit losses as follows:

(in thousands)
 
Allowance for credit losses as of December 31, 2012
$
470

Provision
116

Allowance for credit losses as of March 31, 2013
$
586