QUARTERLY FINANCIAL DATA (UNAUDITED) (Details) (USD $)	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
QUARTERLY FINANCIAL DATA (UNAUDITED)
Oil and gas sales	$ 133,062,418	$ 125,973,199	$ 84,517,472	$ 78,307,013	$ 73,591,893	$ 58,327,823	$ 51,455,094	$ 47,830,431	$ 421,860,102	$ 231,205,241	$ 105,723,993
Operating profit	62,779,799	68,180,143	36,750,600	39,000,509	36,665,466	29,145,797	28,696,782	26,126,248	146,994,854	77,903,050	34,425,434
Net income	$ 25,431,658	$ 17,781,421	$ 14,714,908	$ 11,255,816	$ 13,049,434	$ 3,420,887	$ 21,506,103	$ 8,546,153	$ 69,183,803	$ 46,522,577	$ 12,691,181
Basic net income per common share (in dollars per share)	$ 0.64	$ 0.44	$ 0.36	$ 0.28					$ 1.72	$ 1.17	$ 0.43
Diluted net income per common share (in dollars per share)	$ 0.63	$ 0.44	$ 0.36	$ 0.28					$ 1.71	$ 1.17	$ 0.43
Basic and diluted net income per common share (in dollars per share)					$ 0.32	$ 0.09	$ 0.54	$ 0.22