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Other Accrued Liabilities
12 Months Ended
Dec. 31, 2020
Other Liabilities Disclosure [Abstract]  
Other Accrued Liabilities OTHER ACCRUED LIABILITIES:
December 31,
20202019
Royalties$72,401 $74,061 
Accrued Interest26,549 30,862 
Short-Term Incentive Compensation20,340 21,030 
Transportation Charges15,969 16,533 
Deferred Revenue10,986 13,964 
Accrued Other Taxes10,580 9,115 
Accrued Payroll & Benefits5,009 6,248 
Other26,697 37,610 
Current Portion of Long-Term Liabilities:
Asset Retirement Obligations8,455 5,076 
Salary Retirement
1,787 1,587 
Total Other Accrued Liabilities$198,773 $216,086