XML 67 R49.htm IDEA: XBRL DOCUMENT v3.10.0.1
Supplemental Oil And Gas Disclosures (Tables)
 12 Months Ended
Dec. 31, 2018
Supplemental Oil and Gas Disclosures [Abstract]  
Capitalized Costs Relating to Oil and Gas Producing Activities Disclosure [Table Text Block] The capitalized costs at year end and costs incurred during the year were as follows:
201820172016
 (In thousands)
Capitalized costs:
Proved properties$6,018,568 $5,712,813 $5,446,305 
Unproved properties330,216 296,764 314,867 
6,348,784 6,009,577 5,761,172 
Accumulated depreciation, depletion, amortization, and impairment(5,124,257)(4,996,696)(4,900,304)
Net capitalized costs$1,224,527 $1,012,881 $860,868 
Cost incurred:
Unproved properties acquired$57,430 $47,029 $21,675 
Proved properties acquired15,158 47,638 564 
Exploration15,907 14,811 17,325 
Development280,692 160,941 80,582 
Asset retirement obligation(7,629)(3,613)(30,906)
Total costs incurred$361,558 $266,806 $89,240 
Schedule Of The Oil And Natural Gas Property Costs Not Being Amortized [Table Text Block]
The following table shows a summary of the oil and natural gas property costs not being amortized at December 31, 2018, by the year in which such costs were incurred:
2018201720162015 and Prior Total
 (In thousands)
Unproved properties acquired and wells in progress
$60,372 $46,986 $21,947 $200,911 $330,216 
Results Of Operations For Producing Activities [Table Text Block]
The results of operations for producing activities are as follows:
201820172016
 (In thousands)
Revenues$429,119 $347,285 $282,742 
Production costs(131,328)(113,344)(103,568)
Depreciation, depletion, amortization, and impairment(132,923)(101,326)(274,155)
164,868 132,615 (94,981)
Income tax (expense) benefit(42,915)(52,078)32,696 
Results of operations for producing activities (excluding corporate overhead and financing costs)
$121,953 $80,537 $(62,285)
Schedule Of Proved Developed And Undeveloped Oil And Gas Reserve Quantities [Table Text Block]
Estimated quantities of proved developed oil, NGLs, and natural gas reserves and changes in net quantities of proved developed and undeveloped oil, NGLs, and natural gas reserves were as follows:
Oil
Bbls
NGLs
Bbls
Natural Gas
Mcf
Total
MBoe
 (In thousands)
2016
Proved developed and undeveloped reserves:
Beginning of year16,735 37,687 484,868 135,233 
Revision of previous estimates (1)
(549)(2,473)(31,670)(8,300)
Extensions and discoveries1,816 1,588 13,720 5,690 
Infill reserves in existing proved fields663 2,724 24,704 7,504 
Purchases of minerals in place114 43 630 262 
Production(2,974)(5,014)(55,735)(17,277)
Sales(109)(73)(30,938)(5,338)
End of year15,696 34,482 405,579 117,774 
Proved developed reserves:
Beginning of year14,679 31,218 416,395 115,296 
End of year12,724 28,502 347,121 99,079 
Proved undeveloped reserves:
Beginning of year2,056 6,469 68,473 19,937 
End of year2,972 5,980 58,458 18,695 
2017
Proved developed and undeveloped reserves:
Beginning of year15,696 34,482 405,579 117,774 
Revision of previous estimates (1)
730 4,325 38,330 11,444 
Extensions and discoveries2,235 4,520 49,321 14,975 
Infill reserves in existing proved fields1,632 5,779 52,270 16,123 
Purchases of minerals in place2,019 1,197 15,313 5,768 
Production(2,715)(4,737)(51,260)(15,996)
Sales(84)(80)(903)(314)
End of year19,513 45,486 508,650 149,774 
Proved developed reserves:
Beginning of year12,724 28,502 347,121 99,079 
End of year14,862 33,358 388,446 112,961 
Proved undeveloped reserves:
Beginning of year2,972 5,980 58,458 18,695 
End of year4,651 12,128 120,204 36,813 
2018
Proved developed and undeveloped reserves:
Beginning of year19,513 45,486 508,650 149,774 
Revision of previous estimates180 (1,368)(17,859)(4,165)
Extensions and discoveries3,250 5,149 75,806 21,033 
Infill reserves in existing proved fields1,898 2,795 23,778 8,656 
Purchases of minerals in place701 856 6,897 2,707 
Production(2,874)(4,925)(55,627)(17,070)
Sales(110)(197)(5,682)(1,254)
End of year22,558 47,796 535,963 159,681 
Proved developed reserves:
Beginning of year14,862 33,358 388,446 112,961 
End of year15,192 33,515 377,216 111,576 
Proved undeveloped reserves:
Beginning of year4,651 12,128 120,204 36,813 
End of year7,366 14,281 158,747 48,105 
_________________________
1.Natural gas revisions of previous estimates decreased primarily due to a decline in natural gas prices.
Standardized Measure Of Discounted Future Cash Flows Relating To Proved Reserves Disclosure [Table Text Block]
The standardized measure of discounted future net cash flows (SMOG) was calculated using 12-month average prices and year end costs adjusted for permanent differences that relate to existing proved oil, NGLs, and natural gas reserves. Future income tax expenses consider the Tax Act statutory tax rates. SMOG as of December 31 is as follows:
201820172016
 (In thousands)
Future cash flows$3,980,369 $3,347,396 $2,030,925 
Future production costs(1,479,744)(1,308,244)(861,625)
Future development costs(442,984)(369,560)(173,446)
Future income tax expenses(307,916)(234,152)(141,752)
Future net cash flows1,749,725 1,435,440 854,102 
10% annual discount for estimated timing of cash flows(766,047)(628,270)(335,892)
Standardized measure of discounted future net cash flows relating to proved oil, NGLs, and natural gas reserves
$983,678 $807,170 $518,210 
Schedule Of Principal Sources Of Changes In Standardized Measure Of Discounted Future Net Cash Flows [Table Text Block]
The principal sources of changes in the standardized measure of discounted future net cash flows were as follows:
201820172016
 (In thousands)
Sales and transfers of oil and natural gas produced, net of production costs$(297,791)$(239,953)$(173,920)
Net changes in prices and production costs120,062 236,126 (94,026)
Revisions in quantity estimates and changes in production timing(33,282)87,239 (51,979)
Extensions, discoveries, and improved recovery, less related costs234,172 102,965 84,738 
Changes in estimated future development costs19,535 (5,194)70,976 
Previously estimated cost incurred during the period63,557 36,044 16,602 
Purchases of minerals in place23,416 51,686 2,652 
Sales of minerals in place(5,004)(1,447)(17,248)
Accretion of discount89,753 57,517 69,069 
Net change in income taxes(31,674)(33,389)44,241 
Other—net(6,236)(2,634)(22,381)
Net change176,508 288,960 (71,276)
Beginning of year807,170 518,210 589,486 
End of year$983,678 $807,170 $518,210