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Net Investment in Sales-Type Leases Credit loss balances by evaluation method for impairment (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Financing Receivable, Allowance for Credit Losses [Line Items]    
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment $ 489 $ 178
Financing Receivable Gross - individually evaluated for impairment 489 178
Financing Receivable, Individually Evaluated for Impairment 0 0
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment 118 106
Financing Receivable Gross - collectively evalauated for impairment 18,578 13,940
Financing Receivable, Collectively Evaluated for Impairment 18,460 13,834
Financing Receivable, Allowance for Credit Losses 607 284
Financing Receivable, Gross 19,067 14,118
Financing Receivable, Net $ 18,460 $ 13,834