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Net Investment in Sales-Type Leases - Allowance for Credit Losses (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Mar. 31, 2014
Mar. 31, 2013
Financing Receivable, Allowance for Credit Losses [Roll Forward]            
Allowance for credit losses, beginning of period     $ 167 $ 607 $ 157 $ 184
Current period provision (reversal) (6) 15 (16) 34    
Direct write-downs charged against the allowance 0 0 0 (413)    
Recoveries of amounts previously charged off 0 (25) 0 (54)    
Allowance for credit losses, end of period $ 151 $ 174 $ 151 $ 174 $ 157 $ 184