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Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2019
Accounting Policies [Abstract]  
Schedule of Property, Plant and Equipment, Useful Lives
Depreciation of plant and equipment is calculated on the straight-line method over their estimated useful lives or lease terms, generally as follows:
 
 
Years
Buildings and Improvements
 
10 to 45
Machinery and Equipment
 
3 to 25
Gathering and Transmission
 
30 to 40
Leasehold Improvements
 
Life of Lease


 
December 31,
Property, Plant and Equipment
2019
 
2018
Intangible Drilling Cost
$
4,688,497

 
$
4,120,283

Gas Gathering Equipment
2,463,866

 
2,126,895

Proved Gas Properties
1,208,046

 
1,135,411

Gas Wells and Related Equipment
1,042,000

 
859,359

Unproved Gas Properties
755,590

 
927,667

Surface Land and Other Equipment
226,285

 
238,487

Other
187,722

 
159,326

Total Property, Plant and Equipment
10,572,006

 
9,567,428

Less: Accumulated Depreciation, Depletion and Amortization
3,435,431

 
2,624,984

Total Property, Plant and Equipment - Net
$
7,136,575

 
$
6,942,444