SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Accounts Receivable) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Accounts Receivable
Oil, natural gas, and NGL sales	$ 22,293	$ 50,679
Joint interest billings	5,222	5,845
Tax incentive refunds due from Texas	3,763	6,836
Other	5,494	5,619
Allowance for doubtful accounts	(1,118)	(1,463)
Total accounts receivable	$ 35,654	$ 67,516