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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
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Jun. 30, 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 $ 47   $ 489      
Financing Receivable Gross - individually evaluated for impairment 47   489      
Financing Receivable, Individually Evaluated for Impairment 0   0      
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment 137   118      
Financing Receivable Gross - collectively evalauated for impairment 18,892   18,578      
Financing Receivable, Collectively Evaluated for Impairment 18,755   18,460      
Financing Receivable, Allowance for Credit Losses 184 190 607 659 257 284
Financing Receivable, Gross 18,939   19,067      
Financing Receivable, Net $ 18,755   $ 18,460