Supplemental Oil and Gas Disclosures (Unaudited) (Tables)

12 Months Ended

Dec. 31, 2015

Summary of Estimated Quantities of Proved Developed Oil and Natural Gas Reserves

Estimated quantities of proved oil and gas reserves are summarized as follows:

	Reserves
	Oil (a) (Barrels)		Gas (Mcf)
	(In thousands)
Consolidated entities:
Year-end 2012	3,220		11,722
Revisions of previous estimates	182		1,243
Extensions and discoveries	3,085		2,046
Acquisitions	35		531
Production	(698	)	(1,912	)
Year-end 2013	5,824		13,630
Revisions of previous estimates	608		293
Extensions and discoveries	2,191		774
Acquisitions	85		31
Sales	(105	)	(218	)
Production	(931	)	(1,861	)
Year-end 2014	7,672		12,649
Revisions of previous estimates	(855	)	(1,675	)
Extensions and discoveries	224		173
Acquisitions	—		—
Sales	(704	)	(1,223	)
Production	(1,158	)	(1,967	)
Year-end 2015	5,179		7,957
Our share of ventures accounted for using the equity method:
Year-end 2012	—		2,572
Revisions of previous estimates	—		7
Production	—		(247	)
Year-end 2013	—		2,332
Revisions of previous estimates	—		(382	)
Production	—		(199	)
Year-end 2014	—		1,751
Revisions of previous estimates	—		(320	)
Production	—		(168	)
Year-end 2015	—		1,263
Total consolidated and our share of equity method ventures:
Year-end 2013
Proved developed reserves	3,893		13,717
Proved undeveloped reserves	1,931		2,245
Total Year-end 2013	5,824		15,962
Year-end 2014
Proved developed reserves	5,269		12,599
Proved undeveloped reserves	2,403		1,801
Total Year-end 2014	7,672		14,400
Year-end 2015
Proved developed reserves	5,179		9,220
Proved undeveloped reserves	—		—
Total Year-end 2015	5,179		9,220

Capitalized Costs Relating to Oil and Gas Producing Activities Disclosure [Table Text Block]

Net capitalized costs, utilizing the successful efforts method of accounting, related to our oil and gas producing activities are as follows:

	At Year-End
	2015			2014
	(In thousands)
Unproved leasehold interests	$	19,441		$	90,446
Proved oil and gas properties	119,414			221,299
Total costs	138,855			311,745
Less accumulated depreciation, depletion and amortization	(58,242		)	(48,252		)
	$	80,613		$	263,493

Costs Incurred in Oil and Natural Gas Property Acquisition, Exploration and Development Activities

Costs incurred in oil and gas property acquisition, exploration and development activities, whether capitalized or expensed, follows:

	For the Year
	2015		2014		2013
	(In thousands)
Consolidated entities:
Acquisition costs
Proved properties	$	—	$	2,001	$	—
Unproved properties	4,832		25,666		35,806
Exploration costs	17,922		39,399		10,486
Development costs	27,609		40,277		54,538
	$	50,363	$	107,343	$	100,830

Estimates of Future Cash Flows from Proved Developed Oil and Natural Gas Reserves

Estimates of future cash flows from proved oil and gas reserves are shown in the following table. Estimated income taxes are calculated by applying the appropriate tax rates to the estimated future pre-tax net cash flows less depreciation of the tax basis of properties and the statutory depletion allowance.

	At Year-End
	2015			2014			2013
	(In thousands)
Consolidated entities:
Future cash inflows	$	216,588		$	665,657		$	544,098
Future production and development costs	(93,623		)	(271,735		)	(231,801		)
Future income tax expenses	(22,218		)	(106,002		)	(77,361		)
Future net cash flows	100,747			287,920			234,936
10% annual discount for estimated timing of cash flows	(33,951		)	(124,079		)	(99,383		)
Standardized measure of discounted future net cash flows	$	66,796		$	163,841		$	135,553
Our share in ventures accounted for using the equity method:
Future cash inflows	$	2,283		$	6,186		$	4,765
Future production and development costs	(245		)	(664		)	(512		)
Future income tax expenses	(774		)	(2,098		)	(1,616		)
Future net cash flows	1,264			3,424			2,637
10% annual discount for estimated timing of cash flows	(562		)	(1,649		)	(1,337		)
Standardized measure of discounted future net cash flows	$	702		$	1,775		$	1,300
Total consolidated and our share of equity method ventures	$	67,498		$	165,616		$	136,853

Changes in Standardized Measure of Discounted Future Net Cash Flow

Changes in the standardized measure of discounted future net cash flow follows:

	For the Year
	Consolidated			Our Share of Equity Method Ventures			Total
	(In thousands)
Year-end 2012	$	106,543		$	1,413		$	107,956
Changes resulting from:
Net change in sales prices and production costs	23,422			415			23,837
Net change in future development costs	(2,897		)	—			(2,897		)
Sales of oil and gas, net of production costs	(56,559		)	(801		)	(57,360		)
Net change due to extensions and discoveries	54,539			—			54,539
Net change due to acquisition of reserves	1,160			—			1,160
Net change due to revisions of quantity estimates	8,673			6			8,679
Previously estimated development costs incurred	4,124			—			4,124
Accretion of discount	13,540			228			13,768
Net change in timing and other	(718		)	(31		)	(749		)
Net change in income taxes	(16,274		)	70			(16,204		)
Aggregate change for the year	29,010			(113		)	28,897
Year-end 2013	135,553			1,300			136,853
Changes resulting from:
Net change in sales prices and production costs	(1,064		)	1,571			507
Net change in future development costs	1,308			—			1,308
Sales of oil and gas, net of production costs	(63,192		)	(787		)	(63,979		)
Net change due to extensions and discoveries	58,228			—			58,228
Net change due to acquisition of reserves	2,778			—			2,778
Net change due to divestitures of reserves	(5,804		)	—			(5,804		)
Net change due to revisions of quantity estimates	15,303			(343		)	14,960
Previously estimated development costs incurred	15,497			—			15,497
Accretion of discount	18,067			210			18,277
Net change in timing and other	4,198			115			4,313
Net change in income taxes	(17,031		)	(291		)	(17,322		)
Aggregate change for the year	28,288			475			28,763
Year-end 2014	163,841			1,775			165,616
Changes resulting from:
Net change in sales prices and production costs	(136,536		)	(1,112		)	(137,648		)
Net change in future development costs	92			—			92
Sales of oil and gas, net of production costs	(31,732		)	(428		)	(32,160		)
Net change due to extensions and discoveries	11,747			—			11,747
Net change due to acquisition of reserves	—			—			—
Net change due to divestitures of reserves	(15,855		)				(15,855		)
Net change due to revisions of quantity estimates	(15,164		)	(267		)	(15,431		)
Previously estimated development costs incurred	15,096			—			15,096
Accretion of discount	22,600			286			22,886
Net change in timing and other	4,018			(210		)	3,808
Net change in income taxes	48,689			658			49,347
Aggregate change for the year	(97,045		)	(1,073		)	(98,118		)
Year-end 2015	$	66,796		$	702		$	67,498

Information About Results of Operations of Oil and Natural Gas Interests

Information about the results of operations of our oil and gas interests follows:

	For the Year
	2015			2014			2013
	(In thousands)
Consolidated entities
Revenues	$	51,553		$	82,919		$	69,036
Production costs	(19,820		)	(19,727		)	(12,477		)
Exploration costs	(11,864		)	(17,416		)	(10,486		)
Depreciation, depletion, amortization	(28,774		)	(29,442		)	(19,552		)
Non-cash impairment of proved oil and gas properties and unproved leasehold interests	(164,831		)	(32,665		)	(473		)
Oil and gas administrative expenses	(11,700		)	(17,000		)	(14,407		)
Accretion expense	(144		)	(121		)	(94		)
Income tax expenses	14,717			13,398			(3,471		)
Results of operations	(170,863		)	(20,054		)	8,076
Our share in ventures accounted for using the equity method:
Revenues	$	428		$	786		$	801
Production costs	(102		)	(105		)	(123		)
Oil and gas administrative expenses	(51		)	(95		)	(86		)
Income tax expenses	21			(235		)	(178		)
Results of operations	$	296		$	351		$	414
Total results of operations	$	(170,567	)	$	(19,703	)	$	8,490

Consolidated Entities [Member]

Capitalized Costs Relating to Oil and Gas Producing Activities Disclosure [Table Text Block]

Capitalized costs related to our oil and gas producing activities are as follows:

	At Year-End
	2015			2014
	(In thousands)
Consolidated entities:
Unproved oil and gas properties	$	19,441		$	90,446
Proved oil and gas properties	119,414			221,299
Total costs	138,855			311,745
Less accumulated depreciation, depletion and amortization	(58,242		)	(48,252		)
	$	80,613		$	263,493