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Other Accrued Liabilities
 9 Months Ended
Sep. 30, 2020
Payables and Accruals [Abstract]  
Other Accrued Liabilities OTHER ACCRUED LIABILITIES:
September 30,
2020		December 31,
2019
Royalties$53,343 $74,061 
Transportation Charges19,556 16,533 
Accrued Interest16,896 30,862 
Accrued Other Taxes9,681 9,115 
Deferred Revenue8,934 13,964 
Short-Term Incentive Compensation7,785 21,030 
Accrued Payroll & Benefits6,082 6,248 
Other35,471 37,610 
Current Portion of Long-Term Liabilities:
Asset Retirement Obligations5,076 5,076 
Salary Retirement1,649 1,587 
Total Other Accrued Liabilities$164,473 $216,086