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ACCRUED WARRANTY COSTS (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
ACCRUED WARRANTY COSTS
Beginning balance	$ 40,604,652us-gaap_ProductWarrantyAccrualNoncurrent	$ 58,334,424us-gaap_ProductWarrantyAccrualNoncurrent	$ 47,021,352us-gaap_ProductWarrantyAccrualNoncurrent
Warranty provision	18,569,972us-gaap_ProductWarrantyAccrualWarrantiesIssued	(16,464,540)us-gaap_ProductWarrantyAccrualWarrantiesIssued	12,516,349us-gaap_ProductWarrantyAccrualWarrantiesIssued
Warranty costs incurred	(2,995,595)us-gaap_ProductWarrantyAccrualPayments	(950,626)us-gaap_ProductWarrantyAccrualPayments	(1,185,260)us-gaap_ProductWarrantyAccrualPayments
Ending balance	$ 54,644,261us-gaap_ProductWarrantyAccrualNoncurrent	$ 40,604,652us-gaap_ProductWarrantyAccrualNoncurrent	$ 58,334,424us-gaap_ProductWarrantyAccrualNoncurrent

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- Definition

Carrying value as of the balance sheet date of obligations incurred through that date and due after one year (or beyond the operating cycle if longer) for estimated claims under standard and extended warranty protection rights granted to customers.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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Represents the aggregate decrease in the liability related to payments to satisfy claims for standard and extended product warranties.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

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Represents the aggregate increase in the liability for accruals related to standard and extended product warranties issued during the reporting period.

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