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Supplemental Oil and Gas Disclosures (Unaudited) (Tables)
 12 Months Ended
Dec. 31, 2019
Extractive Industries [Abstract]  
Oil and Gas Property Successful Effort Method
Our share of Laramie Energy's capitalized costs related to oil and gas activities are as follows (in thousands):
 
December 31,
 
2019
 
2018
Company’s share of Laramie Energy
 
 
 
Unproved properties
$
14,722

 
$
16,379

Proved properties
211,083

 
473,763

 
225,805

 
490,142

Accumulated depreciation, depletion, and amortization
(63,791
)
 
(150,075
)
Total
$
162,014

 
$
340,067
Cost Incurred in Oil and Gas Property Acquisition, Exploration, and Development Activities Disclosure
Our share of Laramie Energy's costs incurred in oil and gas activities including costs associated with assets retirement obligations, are as follows (in thousands):
 
Year Ended December 31,
 
2019
 
2018
 
2017
Company’s share of Laramie Energy
 
 
 
 
 
Acquisition costs
$
—

 
$
—

 
$
—

Development costs—other
32,748

 
50,867

 
49,273

Total
$
32,748

 
$
50,867

 
$
49,273
Capitalized Exploratory Well Costs, Roll Forward
A summary of the results of operations for oil and gas producing activities, excluding general and administrative costs, is as follows (in thousands):
 
Year Ended December 31,
 
2019
 
2018
 
2017
Company
 
 
 
 
 
Revenue
 
 
 
 
 
Oil and gas revenues
$
156

 
$
51

 
$
288

Expenses
 
 
 
 
 
Production costs
87

 
191

 
29

Depletion and amortization
6

 
17

 
66

Results of operations of oil and gas producing activities
$
63

 
$
(157
)
 
$
193

 
 
 
 
 
 
Company’s share of Laramie Energy
 
 
 
 
 
Revenue
 
 
 
 
 
Oil and gas revenues
$
89,073

 
$
93,493

 
$
66,783

Expenses
 
 
 
 
 
Production costs
41,446

 
42,706

 
32,606

Impairment of proved properties (1)
163,401

 
—

 
—

Depletion, depreciation, and amortization
38,011

 
26,819

 
21,277

Results of operations of oil and gas producing activities
$
(153,785
)
 
$
23,968

 
$
12,900

 
 
 
 
 
 
Total results of operations of oil and gas producing activities
$
(153,722
)
 
$
23,811

 
$
13,093

__________________________________________________
(1)
Please read Note 3—Investment in Laramie Energy, LLC for further disclosures and information on Laramie Energy's impairment of proved properties.