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NET INVESTMENT IN SALES-TYPE LEASES (Components of Net Investment in Leases) (Details) (USD $)
Mar. 31, 2014
Dec. 31, 2013
Total future minimum lease payments receivable $ 544,714,357 $ 560,187,391
Less: executory cost (131,019,483) (134,447,605)
Less: unearned interest income (233,333,440) (241,234,839)
Net investment in sales - type leases 180,361,434 184,504,947
Current portion 8,353,510 9,063,386
Noncurrent portion $ 172,007,924 $ 175,441,561