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Other Accrued Liabilities
 6 Months Ended
Jun. 30, 2020
Payables and Accruals [Abstract]  
Other Accrued Liabilities OTHER ACCRUED LIABILITIES:
June 30,
2020		December 31,
2019
Royalties$50,831  $74,061  
Accrued Interest25,304  30,862  
Transportation Charges22,353  16,533  
Accrued Other Taxes11,660  9,115  
Accrued Payroll & Benefits6,608  6,248  
Short-Term Incentive Compensation5,178  21,030  
Deferred Revenue3,423  13,964  
Other30,755  37,610  
Current Portion of Long-Term Liabilities:
Asset Retirement Obligations5,076  5,076  
Salary Retirement1,629  1,587  
Total Other Accrued Liabilities$162,817  $216,086