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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
Mar. 31, 2013
Dec. 31, 2012
Mar. 31, 2012
Dec. 31, 2011
Financing Receivable, Allowance for Credit Losses [Line Items]        
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment $ 59 $ 489    
Financing Receivable Gross - individually evaluated for impairment 59 489    
Financing Receivable, Individually Evaluated for Impairment 0 0    
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment 131 118    
Financing Receivable Gross - collectively evalauated for impairment 18,484 18,578    
Financing Receivable, Collectively Evaluated for Impairment 18,353 18,460    
Financing Receivable, Allowance for Credit Losses 190 607 257 284
Financing Receivable, Gross 18,543 19,067    
Financing Receivable, Net $ 18,353 $ 18,460