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Net Investment in Sales-Type Leases - Credit Losses and Recorded Investment in Sales-Type Leases (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Net Investment in Sales-Type Leases [Abstract]            
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment $ 0   $ 0      
Financing Receivable Gross - individually evaluated for impairment   0 0      
Financing Receivable, Individually Evaluated for Impairment 0   0      
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment 157   167      
Financing Receivable Gross - collectively evalauated for impairment 16,502   16,884      
Financing Receivable, Collectively Evaluated for Impairment 16,345   16,717      
Financing Receivable, Allowance for Credit Losses 157 169 167 184 190 607
Financing Receivable, Gross 16,502   16,884      
Financing Receivable, Net $ 16,345   $ 16,717