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Net Investment in Sales-Type Leases allowance credit loss rollforward (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Financing Receivable, Allowance for Credit Losses [Roll Forward]  
Allowance for credit losses, beginning of period $ 284
Current period provision (reversal) 425
Recoveries of amounts previously charged off (102)
Allowance for credit losses, end of period $ 607