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Significant Accounting Policies (Tables)
12 Months Ended
Dec. 31, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Schedule of Cash and Cash Equivalents
The following table provides a reconciliation of cash, cash equivalents, and restricted cash to amounts shown in the statement of cash flows:
December 31,
202020192018
Cash and Cash Equivalents$15,617 $16,283 $17,198 
Restricted Cash, Current Portion735 — — 
Restricted Cash, Less Current Portion 5,247 — — 
Total Cash, Cash Equivalents and Restricted Cash$21,599 $16,283 $17,198 
Restrictions on Cash and Cash Equivalents
The following table provides a reconciliation of cash, cash equivalents, and restricted cash to amounts shown in the statement of cash flows:
December 31,
202020192018
Cash and Cash Equivalents$15,617 $16,283 $17,198 
Restricted Cash, Current Portion735 — — 
Restricted Cash, Less Current Portion 5,247 — — 
Total Cash, Cash Equivalents and Restricted Cash$21,599 $16,283 $17,198 
Schedule of Allowance for Credit Loss
The following represents the roll forward of the allowance for credit losses for the years ended:
December 31,
20202019
Allowance for Credit Losses - Trade, Beginning of Year$— $— 
Provision for Expected Credit Losses84 — 
Allowance for Credit Losses - Trade, End of Period$84 $— 
Allowance for Credit Losses - Other Receivables, Beginning of Year$2,463 $2,038 
Provision for Expected Credit Losses2,760 595 
Write-off of Uncollectible Accounts(1,975)(170)
Allowance for Credit Losses - Other Receivables, End of Period$3,248 $2,463 
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 ImprovementsLife of Lease
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