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Other Accrued Liabilities
 3 Months Ended
Mar. 31, 2020
Payables and Accruals [Abstract]  
Other Accrued Liabilities OTHER ACCRUED LIABILITIES:
March 31,
2020		December 31,
2019
Royalties$70,803  $74,061  
Accrued Interest25,800  30,862  
Transportation Charges22,355  16,533  
Deferred Revenue12,123  13,964  
Accrued Other Taxes9,385  9,115  
Accrued Payroll & Benefits6,209  6,248  
Short-Term Incentive Compensation2,626  21,030  
Other41,145  37,610  
Current Portion of Long-Term Liabilities:
Asset Retirement Obligations5,076  5,076  
Salary Retirement1,608  1,587  
Total Other Accrued Liabilities$197,130  $216,086