ORGANIZATION AND PRINCIPAL ACTIVITIES (Financial Information of the Company's VIEs) (Details) (USD $)	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Variable Interest Entity [Line Items]
Total current assets	$ 269,062,719us-gaap_AssetsCurrent	$ 204,736,461us-gaap_AssetsCurrent
Total assets	432,580,703us-gaap_Assets	419,240,309us-gaap_Assets
Total current liabilities	100,790,467us-gaap_LiabilitiesCurrent	67,370,807us-gaap_LiabilitiesCurrent
Total liabilities	110,650,467us-gaap_Liabilities	86,630,807us-gaap_Liabilities
Net cash provided by operating activities	31,069,303	35,729,510	46,655,914
Net cash (used in) provided by investing activities	(32,117,597)	(43,944,598)	(41,206,784)
Net cash (used in) financing activities	(16,914,796)	8,956,797	(14,313,046)
Sales [Member] \| Variable Interest Entity Concentration Risk [Member]
Variable Interest Entity [Line Items]
Concentration risk, percentage	95.70%	97.30%	95.30%
Assets, Total [Member] \| Variable Interest Entity Concentration Risk [Member]
Variable Interest Entity [Line Items]
Concentration risk, percentage	48.80%	62.00%
Liabilities, Total [Member] \| Variable Interest Entity Concentration Risk [Member]
Variable Interest Entity [Line Items]
Concentration risk, percentage	54.90%	88.60%
VIEs [Member]
Variable Interest Entity [Line Items]
Total current assets	134,777,487	140,476,592
Total assets	211,055,266	259,746,443
Total current liabilities	50,862,163	57,510,282
Total liabilities	60,722,163	76,770,282
Revenues	217,859,413	168,999,541	172,090,218
Net income	22,996,737	16,439,680	28,331,383
Net cash provided by operating activities	26,682,007	28,830,017	43,021,136
Net cash (used in) provided by investing activities	28,503,343	(38,188,141)	(53,172,297)
Net cash (used in) financing activities	$ (21,201,273)	$ (6,588,420)

Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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