Condensed Consolidated Statements of Comprehensive (Loss) Income (Unaudited) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Net income (loss)	$ 48,707,990	$ (532,782)	$ 47,380,476	$ 104,692,318
Unrealized (loss) gain on investments	2,353	42,945	(92,293)	57,387
Comprehensive income (loss)	$ 48,710,343	$ (489,837)	$ 47,288,183	$ 104,749,705