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SUPPLEMENTAL OIL AND GAS INFORMATION (UNAUDITED) (Tables)
12 Months Ended
Dec. 31, 2019
Extractive Industries [Abstract]  
Schedule of costs incurred in crude oil and natural gas acquisition, exploration and development activities Capitalized costs are summarized as follows for the years ended December 31, 2019, 2018 and 2017, respectively:
 December 31,
(In thousands)201920182017
Capitalized Certain Payroll and Other Internal Costs$995  $882  $930  
Capitalized Interest Costs644  147  148  
Total$1,638  $1,029  $1,078  
The costs incurred in crude oil and natural gas acquisition, exploration and development activities are highlighted in the table below.

 December 31,
 (In thousands)201920182017
Costs Incurred for the Year:
Proved Property Acquisition and Other$375,145  $582,697  $15,722  
Unproved Property Acquisition9,540  4,903  717  
Development369,233  260,945  139,532  
Total$753,918  $848,545  $155,971  
The Company is unable to predict the future impact on depletion rates.  The following is a summary of capitalized costs excluded from depletion at December 31, 2019 by year incurred.
 December 31,
(In thousands)201920182017Prior Years
Property Acquisition$6,594  $3,497  $75  $881  
Development—  —  —  —  
Total$6,594  $3,497  $75  $881  
Schedule of estimates of its proved crude oil and natural gas reserves
The following tables present the Company’s independent petroleum consultants’ estimates of its proved crude oil and natural gas reserves.  The Company emphasizes that reserves are approximations and are expected to change as additional information becomes available.  Reservoir engineering is a subjective process of estimating underground accumulations of crude oil and natural gas that cannot be measured in an exact way, and the accuracy of any reserve estimate is a function of the quality of available data and of engineering and geological interpretation and judgment.

(In thousands)Natural Gas
(MCF)
Oil
(BBLS)
BOE
Proved Developed and Undeveloped Reserves at December 31, 201646,832  46,275  54,081  
  Revisions of Previous Estimates8,839  890  2,363  
  Extensions, Discoveries and Other Additions27,637  20,184  24,791  
  Production(5,188) (4,537) (5,402) 
Proved Developed and Undeveloped Reserves at December 31, 201778,121  62,812  75,832  
  Revisions of Previous Estimates426  3,470  3,541  
  Extensions, Discoveries and Other Additions28,348  28,516  33,241  
  Purchases of Minerals in Place37,397  25,965  32,198  
  Production(9,225) (7,790) (9,328) 
Proved Developed and Undeveloped Reserves at December 31, 2018135,066  112,973  135,484  
Revisions of Previous Estimates(5,146) (15,497) (16,355) 
Extensions, Discoveries and Other Additions22,019  19,992  23,662  
Purchases of Minerals in Place53,969  25,611  34,606  
Production(16,591) (11,325) (14,091) 
Proved Developed and Undeveloped Reserves at December 31, 2019189,318  131,754  163,307  
Proved Developed Reserves:  
December 31, 201632,808  32,245  37,713  
December 31, 201746,518  38,593  46,346  
December 31, 201882,315  62,497  76,216  
December 31, 2019116,846  77,160  96,634  
Proved Undeveloped Reserves:  
December 31, 201614,024  14,030  16,368  
December 31, 201731,603  24,220  29,487  
December 31, 201852,752  50,476  59,268  
December 31, 201972,473  54,594  66,673  
Summary of standardized measure of discounted future net cash flows
The following table presents a standardized measure of discounted future net cash flows relating to proved crude oil and natural gas reserves and the changes in standardized measure of discounted future net cash flows relating to proved crude oil and natural gas were prepared in accordance with the provisions of ASC 932 Extractive Activities - Oil and Gas. Future cash inflows were computed by applying average prices of crude oil and natural gas for the last 12 months to estimated future production. Future production and development costs were computed by estimating the expenditures to be incurred in developing and producing the proved crude oil and natural gas reserves at the end of the year, based on year end costs and assuming continuation of existing economic conditions.  Future income tax expenses were calculated by applying appropriate year end tax rates to future pretax cash flows relating to proved crude oil and natural gas reserves, less the tax basis of properties involved and tax credits and loss carry forwards relating to crude oil and natural gas producing activities.  Future net cash flows are discounted at the rate of 10% annually to derive the standardized measure of discounted future cash flows. Actual future cash inflows may vary considerably, and the standardized measure does not necessarily represent the fair value of the Company’s crude oil and natural gas reserves.
 December 31,
(In thousands)201920182017
Future Cash Inflows$7,059,586  $7,524,587  $3,143,604  
Future Production Costs(2,868,762) (2,605,279) (1,265,525) 
Future Development Costs(855,041) (784,615) (409,360) 
Future Income Tax Expense(320,528) (611,989) (27,476) 
Future Net Cash Inflows$3,015,255  $3,522,704  $1,441,243  
10% Annual Discount for Estimated Timing of Cash Flows(1,337,194) (1,643,061) (687,257) 
Standardized Measure of Discounted Future Net Cash Flows$1,678,061  $1,879,643  $753,986  
Prices for reserve estimates The prices for the Company’s reserve estimates were as follows:
Natural Gas
MCF
Oil
Bbl
December 31, 2019$2.12  $50.53  
December 31, 2018$4.50  $61.23  
December 31, 2017$3.34  $45.90  
Changes in the Standardized Measure of Discounted Future Net Cash Flows at 10%
Changes in the Standardized Measure of Discounted Future Net Cash Flows at 10% per annum follow:
 December 31,
(In thousands)201920182017
Beginning of Period$1,879,643  $753,986  $379,026  
Sales of Oil and Natural Gas Produced, Net of Production Costs(424,548) (381,961) (153,626) 
Extensions and Discoveries282,528  549,353  217,146  
Previously Estimated Development Cost Incurred During the Period
100,987  115,542  46,834  
Net Change of Prices and Production Costs(680,119) 484,122  216,217  
Change in Future Development Costs(174,729) (91,829) (34,753) 
Revisions of Quantity and Timing Estimates(226,721) 66,185  28,915  
Accretion of Discount218,023  75,800  37,942  
Change in Income Taxes156,621  (296,571) (3,617) 
Purchases of Minerals in Place338,289  502,193  —  
Other208,087  102,823  19,902  
End of Period$1,678,061  $1,879,643  $753,986