Annual report pursuant to Section 13 and 15(d)

Note 20 - Supplemental Oil and Gas Disclosures - Unaudited (Tables)

v3.19.3.a.u2
Note 20 - Supplemental Oil and Gas Disclosures - Unaudited (Tables)
 12 Months Ended
Dec. 31, 2019
Notes Tables  
Capitalized Costs Relating to Oil and Gas Producing Activities Disclosure [Table Text Block]
   
December 31,
  
   
2019
    
2018
    
2017
  
Net capitalized cost:
      
 
      
 
      
 
Proved oil and natural gas properties and equipment
   $
8,532.2
     $
8,169.9
     $
8,102.0
  
Accumulated depreciation, depletion and amortization related to oil, NGLs and natural gas activities
    
(7,793.3
 )    
(7,665.1
 )    
(7,525.0
 )
Net capitalized costs related to producing activities
   $
738.9
     $
504.8
     $
577.0
  
Cost Incurred in Oil and Gas Property Acquisition, Exploration, and Development Activities Disclosure [Table Text Block]
   
Year Ended December 31,
  
   
2019
    
2018
    
2017
  
Costs incurred: (1)
      
 
      
 
      
 
Proved properties acquisitions
   $
223.8
     $
24.1
     $
1.1
  
Exploration (2) (3)
    
30.6
      
49.9
      
62.0
  
Development
    
114.5
      
56.2
      
92.5
  
Total costs incurred in oil and gas property acquisition, exploration and development activities
   $
368.9
     $
130.2
     $
155.6
  
Schedule of Amortization Expense Per Unit of Production [Table Text Block]
   
Year Ended December 31,
  
   
2019
    
2018
    
2017
  
Depreciation, depletion, amortization and accretion per Boe
   $
10.01
     $
11.24
     $
10.68
  
Schedule of Proved Developed and Undeveloped Oil and Gas Reserve Quantities [Table Text Block]
     
 
 
  
 
 
  
 
 
Total Energy Equivalent Reserves (1)
  
   
Oil (MMBbls)
  
NGLs (MMBbls)
  
Natural Gas (Bcf)
  
Oil Equivalent (MMBoe)
  
Natural Gas Equivalent (Bcfe)
  
Proved reserves as of Dec. 31, 2016
    
32.9
    
8.2
    
197.8
    
74.0
    
444.0
  
Revisions of previous estimates (2)
    
4.5
    
0.7
    
25.8
    
9.6
    
57.4
  
Extensions and discoveries (3)
    
4.1
    
0.3
    
5.4
    
5.2
    
31.3
  
Production
    
(7.1
 )  
(1.4
 )  
(36.8
 )  
(14.6
 )  
(87.4
 )
Proved reserves as of Dec. 31, 2017
    
34.4
    
7.8
    
192.2
    
74.2
    
445.3
  
Revisions of previous estimates (4)
    
11.6
    
2.8
    
40.4
    
21.1
    
126.7
  
Extensions and discoveries (5)
    
0.5
    
0.3
    
7.7
    
2.1
    
12.6
  
Purchase of minerals in place (6)
    
1.5
    
0.4
    
9.4
    
3.4
    
20.7
  
Sales of minerals in place (7)
    
(2.2
 )  
(0.2
 )  
(7.2
 )  
(3.5
 )  
(21.2
 )
Production
    
(6.7
 )  
(1.3
 )  
(32.0
 )  
(13.3
 )  
(80.0
 )
Proved reserves as of Dec. 31, 2018
    
39.1
    
9.8
    
210.5
    
84.0
    
504.1
  
Revisions of previous estimates (8)
    
1.4
    
(1.5
 )  
(16.9
 )  
(3.0
 )  
(18.2
 )
Extensions and discoveries (9)
    
0.9
    
0.1
    
1.2
    
1.1
    
6.7
  
Purchase of minerals in place (10)
    
3.1
    
17.4
    
417.6
    
90.1
    
540.9
  
Production
    
(6.7
 )  
(1.3
 )  
(41.3
 )  
(14.8
 )  
(89.0
 )
Proved reserves as of Dec. 31, 2019
    
37.8
    
24.5
    
571.1
    
157.4
    
944.5
  
                                 
Year-end proved developed reserves:
                                
2019
    
28.0
    
21.7
    
504.9
    
133.8
    
802.9
  
2018
    
31.5
    
7.8
    
166.8
    
67.0
    
402.2
  
2017
    
26.1
    
7.2
    
173.5
    
62.2
    
373.3
  
                                 
Year-end proved undeveloped reserves:
                                
2019 (11)    
9.8
    
2.8
    
66.2
    
23.6
    
141.6
  
2018
    
7.6
    
2.0
    
43.7
    
17.0
    
101.9
  
2017
    
8.3
    
0.6
    
18.7
    
12.0
    
72.0
  
Schedule Of Prices Weighted By Field Production Related To The Proved Reserves [Table Text Block]
   
December 31,
  
   
2019
    
2018
    
2017
    
2016
  
Oil - per barrel
   $
58.11
     $
65.21
     $
46.58
     $
36.28
  
NGLs per barrel
    
18.72
      
29.73
      
22.65
      
16.82
  
Natural gas per Mcf
    
2.63
      
3.13
      
2.86
      
2.47
  
Standardized Measure of Discounted Future Cash Flows Relating to Proved Reserves Disclosure [Table Text Block]
   
Year Ended December 31,
  
   
2019
    
2018
    
2017
  
Standardized Measure of Discounted Future Net Cash Flows
      
 
      
 
      
 
Future cash inflows
   $
4,153.8
     $
3,500.9
     $
2,328.8
  
Future costs:
                        
Production
    
(1,901.1
 )    
(958.5
 )    
(813.8
 )
Development
    
(297.3
 )    
(272.4
 )    
(157.4
 )
Dismantlement and abandonment
    
(497.4
 )    
(355.9
 )    
(361.9
 )
Income taxes
    
(170.5
 )    
(293.9
 )    
(74.8
 )
Future net cash inflows before 10% discount
    
1,287.5
      
1,620.2
      
920.9
  
10% annual discount factor
    
(300.6
 )    
(553.2
 )    
(180.3
 )
Total
   $
986.9
     $
1,067.0
     $
740.6
  
Schedule of Changes in Standardized Measure of Discounted Future Net Cash Flows [Table Text Block]
   
Year Ended December 31,
  
   
2019
    
2018
    
2017
  
Changes in Standardized Measure
      
 
      
 
      
 
Standardized measure, beginning of year
   $
1,067.0
     $
740.6
     $
478.3
  
Increases (decreases):
                        
Sales and transfers of oil and gas produced, net of production costs    
(315.8
 )    
(398.1
 )    
(315.3
 )
Net changes in price, net of future production costs    
(376.4
 )    
571.5
      
288.0
  
Extensions and discoveries, net of future production and development costs    
27.0
      
53.6
      
119.3
  
Changes in estimated future development costs    
(6.0
 )    
(114.7
 )    
(38.9
 )
Previously estimated development costs incurred    
19.3
      
48.4
      
102.8
  
Revisions of quantity estimates    
116.4
      
307.6
      
106.4
  
Accretion of discount    
107.4
      
50.5
      
30.2
  
Net change in income taxes    
62.9
      
(133.4
 )    
(54.7
 )
Purchases of reserves in-place    
298.3
      
27.8
      
—
  
Sales of reserves in-place    
—
      
(54.1
 )    
—
  
Changes in production rates due to timing and other    
(13.2
 )    
(32.7
 )    
24.5
  
Net (decrease) increase
    
(80.1
 )    
326.4
      
262.3
  
Standardized measure, end of year
   $
986.9
     $
1,067.0
     $
740.6