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Net Investment in Finance Leases (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Dec. 31, 2012
Components of the net investment in finance leases    
Gross finance lease receivables $ 145,951 $ 152,321
Allowance on gross finance lease receivables (823) (897)
Gross finance lease receivables, net of allowance 145,128 151,424
Unearned income (27,888) (29,491)
Net investment in finance leases $ 117,240 $ 121,933
Loss experience on its gross finance lease receivables, after considering equipment recoveries (as a percent) 1.00%