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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, 2013
Dec. 31, 2012
Financing Receivable, Allowance for Credit Losses [Line Items]    
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment $ 0 $ 489
Financing Receivable Gross - individually evaluated for impairment 0 489
Financing Receivable, Individually Evaluated for Impairment 0 0
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment 167 118
Financing Receivable Gross - collectively evalauated for impairment 16,884 18,578
Financing Receivable, Collectively Evaluated for Impairment 16,717 18,460
Financing Receivable, Allowance for Credit Losses 167 607
Financing Receivable, Gross 16,884 19,067
Financing Receivable, Net $ 16,717 $ 18,460