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Property, Plant and Equipment
 12 Months Ended
Dec. 31, 2020
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment PROPERTY, PLANT AND EQUIPMENT:
December 31,
Property, Plant and Equipment20202019
Intangible Drilling Cost$4,965,252 $4,688,497 
Gas Gathering Equipment2,510,917 2,463,866 
Proved Gas Properties1,253,094 1,208,046 
Gas Wells and Related Equipment1,120,061 1,042,000 
Unproved Gas Properties725,705 755,590 
Surface Land and Other Equipment199,322 226,285 
Other 189,645 187,722 
Total Property, Plant and Equipment10,963,996 10,572,006 
Less: Accumulated Depreciation, Depletion and Amortization3,938,451 3,435,431 
Total Property, Plant and Equipment - Net$7,025,545 $7,136,575 

During the years ended December 31, 2020 and 2019, the Company capitalized $1,328 and $5,482, respectively, of interest on Gas Gathering Equipment under construction.

Amounts below reflect properties where drilling operations have not yet commenced and therefore, were not being amortized for the years ended December 31, 2020 and 2019, respectively. These assets will be amortized using the units-of-production method and reclassified to proved gas properties when placed in service.
December 31,
20202019
Unproved Gas Properties$725,705 $755,590 
Advance Royalties9,676 12,770 
     Total$735,381 $768,360