AVAILABLE-FOR-SALE SECURITIES (Details 5) - USD ($)	Jun. 30, 2015	Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items]
Less than one year	$ 0	$ 0
Greater than one year and less than five years	62,111,743	35,855,146
Greater than or equal to five years	429,472,853	332,460,592
Total	$ 491,584,596	$ 368,315,738