OIL AND GAS RESERVE DATA (UNAUDITED) (Tables)

12 Months Ended

Dec. 31, 2015

OIL AND GAS RESERVE DATA (UNAUDITED)

Schedule of summary of changes in proved reserves

	Oil (MBbls)			Gas (MMcf)			Equivalent Units (MBoe)
Proved reserves:
Balance at December 31, 2013		16,074			106,028			33,745
Purchases of oil and gas reserves in place		—			204,839			34,140
Discoveries and extensions		481			23,533			4,403
Revisions of previous estimates		1,357			9,013			2,859
Production		(1,118	)		(16,085	)		(3,799	)
Balance at December 31, 2014		16,794			327,328			71,348
Purchases of oil and gas reserves in place		—			—			—
Discoveries and extensions		69			4,654			845
Revisions of previous estimates		(2,944	)		(140,218	)		(26,314	)
Production		(980	)		(28,033	)		(5,652	)
Balance at December 31, 2015		12,939			163,731			40,227
Proved reserves at December 31, 2014:
Proved developed reserves		8,561			203,272			42,439
Proved undeveloped reserves		8,233			124,056			28,909
		16,794			327,328			71,348
Proved reserves at December 31, 2015:
Proved developed reserves		6,824			153,093			32,339
Proved undeveloped reserves		6,115			10,638			7,888
		12,939			163,731			40,227

Schedule of standardized measure of discounted future net cash flows related to proved oil and gas reserves

	2015			2014
Future cash inflows	$	862,751		$	2,510,062
Future production costs and taxes		(503,702	)		(967,776	)
Future development costs(1)		(180,790	)		(390,057	)
Future income tax expenses		—			(140,458	)
Net future cash flows		178,259			1,011,771
Discounted at 10% for estimated timing of cash flows		(82,236	)		(456,704	)
Standardized measure of discounted future net cash flows	$	96,023		$	555,067

(1)           Includes future estimated asset retirement obligations of $55.8 million in 2015 and $69.7 million in 2014.

Schedule of changes in standardized measure of discounted future net cash flows related to proved oil and gas reserves

	2015			2014
Sales, net of production costs and taxes	$	(34,176	)	$	(97,028	)
Discoveries and extensions		2,540			40,720
Purchases of reserves in place		—			206,334
Changes in prices and production costs		(342,650	)		(84,548	)
Revisions of quantity estimates		(202,716	)		47,425
Development costs incurred		12,869			92,983
Net changes in development costs		131,919			(134,255	)
Interest factor—accretion of discount		55,506			50,371
Net change in income taxes		(54,059	)		(25,354	)
Changes in production rates (timing) and other		(28,277	)		(16,582	)
Net (decrease) increase		(459,044	)		80,066
Balance at beginning of year		555,067			475,001
Balance at end of year	$	96,023		$	555,067