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BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Computation of Basic and Diluted Earnings per Share) (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES [Abstract]
Net income	$ 4,113,216	$ 5,584,346	$ 13,088,997	$ 29,972,600
Basic: Weighted-average common shares outstanding during the period	34,560,743	34,620,004	34,560,743	34,694,607
Add: Dilutive effect of stock options	139,246		396,476	1,057
Diluted	34,699,989	34,620,004	34,957,219	34,695,664
Basic	$ 0.12	$ 0.16	$ 0.38	$ 0.86
Diluted	$ 0.12	$ 0.16	$ 0.37	$ 0.86

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