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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, 2014
Dec. 31, 2013
Mar. 31, 2013
Dec. 31, 2012
Financing Receivable, Allowance for Credit Losses [Line Items]        
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 169 167    
Financing Receivable Gross - collectively evalauated for impairment 17,123 16,884    
Financing Receivable, Collectively Evaluated for Impairment 16,954 16,717    
Financing Receivable, Allowance for Credit Losses 169 167 190 607
Financing Receivable, Gross 17,123 16,884    
Financing Receivable, Net $ 16,954 $ 16,717