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Supplemental Oil and Gas Disclosures (Unaudited) (Tables)
 12 Months Ended
Dec. 31, 2016
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 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

Revisions of previous estimates
(11
)
 
631

Extensions and discoveries
29

 
—

Acquisitions
—

 
—

Sales
(4,460
)
 
(3,756
)
Production
(291
)
 
(996
)
Year-end 2016
446

 
3,836

Our share of ventures accounted for using the equity method:
 
 
 
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

Revisions of previous estimates
—

 
79

Production
—

 
(143
)
Year-end 2016
—

 
1,199

Total consolidated and our share of equity method ventures:
 
 
 
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

Year-end 2016
 
 
 
Proved developed reserves
446

 
5,035

Proved undeveloped reserves
—

 
—

Total Year-end 2016
446

 
5,035


 _____________________
(a) 
Includes natural gas liquids (NGLs).
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
 
2016
 
2015
 
2014
 
(In thousands)
Consolidated entities:
 
 
 
 
 
Acquisition costs
 
 
 
 
 
Proved properties
$
—

 
$
—

 
$
2,001

Unproved properties
15

 
4,832

 
25,666

Exploration costs
21

 
17,922

 
39,399

Development costs
537

 
27,609

 
40,277

 
$
573

 
$
50,363

 
$
107,343
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
 
2016
 
2015
 
2014
 
(In thousands)
Consolidated entities:
 
 
 
 
 
Future cash inflows
$
24,304

 
$
216,588

 
$
665,657

Future production and development costs
(2,988
)
 
(93,623
)
 
(271,735
)
Future income tax expenses
(3,926
)
 
(22,218
)
 
(106,002
)
Future net cash flows
17,390

 
100,747

 
287,920

10% annual discount for estimated timing of cash flows
(7,077
)
 
(33,951
)
 
(124,079
)
Standardized measure of discounted future net cash flows
$
10,313

 
$
66,796

 
$
163,841

Our share in ventures accounted for using the equity method:
 
 
 
 
 
Future cash inflows
$
2,010

 
$
2,283

 
$
6,186

Future production and development costs
(216
)
 
(245
)
 
(664
)
Future income tax expenses
(537
)
 
(774
)
 
(2,098
)
Future net cash flows
1,257

 
1,264

 
3,424

10% annual discount for estimated timing of cash flows
(585
)
 
(562
)
 
(1,649
)
Standardized measure of discounted future net cash flows
$
672

 
$
702

 
$
1,775

Total consolidated and our share of equity method ventures
$
10,985

 
$
67,498

 
$
165,616
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 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

Changes resulting from:
 
 
 
 
 
Net change in sales prices and production costs
(3,585
)
 
(60
)
 
(3,645
)
Net change in future development costs
—

 
—

 
—

Sales of oil and gas, net of production costs
(5,663
)
 
(208
)
 
(5,871
)
Net change due to extensions and discoveries
410

 
—

 
410

Net change due to acquisition of reserves
—

 
—

 
—

Net change due to divestitures of reserves
(63,535
)
 
 
 
(63,535
)
Net change due to revisions of quantity estimates
1,304

 
63

 
1,367

Previously estimated development costs incurred
—

 
—

 
—

Accretion of discount
2,992

 
113

 
3,105

Net change in timing and other
(128
)
 
(80
)
 
(208
)
Net change in income taxes
11,722

 
142

 
11,864

Aggregate change for the year
(56,483
)
 
(30
)
 
(56,513
)
Year-end 2016
$
10,313

 
$
672

 
$
10,985
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
 
2016
 
2015
 
2014
 
(In thousands)
Consolidated entities
 
 
 
 
 
Revenues
$
10,111

 
$
51,553

 
$
82,919

Production costs
(4,392
)
 
(19,820
)
 
(19,727
)
Exploration costs
(124
)
 
(11,864
)
 
(17,416
)
Depreciation, depletion, amortization
(2,157
)
 
(28,774
)
 
(29,442
)
Non-cash impairment of proved oil and gas properties and unproved leasehold interests
(612
)
 
(164,831
)
 
(32,665
)
Oil and gas administrative expenses
(8,700
)
 
(11,700
)
 
(17,000
)
Accretion expense
(56
)
 
(144
)
 
(121
)
Income tax (expense) benefit
(20
)
 
14,717

 
13,398

Results of operations
(5,950
)
 
(170,863
)
 
(20,054
)
Our share in ventures accounted for using the equity method:
 
 
 
 
 
Revenues
$
284

 
$
428

 
$
786

Production costs
(76
)
 
(102
)
 
(105
)
Oil and gas administrative expenses
(35
)
 
(51
)
 
(95
)
Income tax (expense) benefit
—

 
21

 
(235
)
Results of operations
$
173

 
$
296

 
$
351

Total results of operations
$
(5,777
)
 
$
(170,567
)
 
$
(19,703
)
Consolidated Entities  
Capitalized Costs Relating to Oil and Gas Producing Activities Disclosure
Capitalized costs related to our oil and gas producing activities classified as assets held for sale at year-end 2016 are as follows:
 
At Year-End
 
2016
 
2015
 
(In thousands)
Consolidated entities:
 
 
 
Unproved oil and gas properties
$
374

 
$
19,441

Proved oil and gas properties
5,159

 
119,414

Total costs
5,533

 
138,855

Less accumulated depreciation, depletion and amortization
(4,751
)
 
(58,242
)
 
$
782

 
$
80,613