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Supplemental Oil and Gas Disclosures (Tables)
 12 Months Ended
Dec. 31, 2018
Oil and Gas Exploration and Production Industries Disclosures [Abstract]  
Capitalized Costs Related to Oil and Natural Gas Producing Activities
The following table sets forth the capitalized costs related to the Company’s oil and natural gas producing activities:
 
At December 31,
 
2018
 
2017
 
(In thousands)
Proved oil and gas properties(1)
$
7,878,104

 
$
7,058,782

Less: Accumulated depreciation, depletion, amortization and impairment
(2,853,353
)
 
(2,395,153
)
Proved oil and gas properties, net
5,024,751

 
4,663,629

Unproved oil and gas properties
1,034,085

 
780,173

Total oil and gas properties, net
$
6,058,836

 
$
5,443,802


__________________ 
(1)
Included in the Company’s proved oil and gas properties are estimates of future asset retirement costs of $40.5 million and $38.4 million at December 31, 2018 and 2017, respectively.
Costs Incurred in Oil and Natural Gas Property Acquisition, Exploration and Development Activities
The following table sets forth costs incurred related to the Company’s oil and natural gas activities for the periods presented:
 
Year Ended December 31,
 
2018
 
2017
 
2016
 
(In thousands)
Acquisition costs:
 
 
 
 
 
Proved oil and gas properties
$
260,034

 
$
61,874

 
$
781,522

Unproved oil and gas properties
696,293

 
5,424

 
672

Exploration costs
53,928

 
11,600

 
1,792

Development costs
923,562

 
511,905

 
207,766

Asset retirement costs
5,804

 
(2,965
)
 
26,795

Total costs incurred
$
1,939,621

 
$
587,838

 
$
1,018,547
Results of Operations for Oil and Natural Gas Producing Activities
The following table sets forth the results of operations for oil and natural gas producing activities, which exclude straight-line depreciation, general and administrative expenses and interest expense, for the periods presented:
 
Year Ended December 31,
 
2018
 
2017
 
2016
 
(In thousands)
Revenues
$
1,590,024

 
$
1,034,634

 
$
625,233

Production costs
434,801

 
321,007

 
222,117

Depreciation, depletion and amortization
613,928

 
515,600

 
462,320

Exploration costs
27,432

 
11,600

 
1,785

Impairment
384,228

 
6,887

 
2,252

Income tax expense (benefit)
30,770

 
67,148

 
(23,665
)
Results of operations for oil and natural gas producing activities
$
98,865

 
$
112,392

 
$
(39,576
)