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Supplemental Disclosures to the Balance Sheets and Statements of Cash Flows - Schedule of Accounts Payable and Accrued Expenses (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018	Feb. 28, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Accounts payable-trade	$ 25,475	$ 13,564
Accrued expenses	45,589	66,417
Royalties payable	25,385	26,189
Taxes other than income tax liability	9,150	10,766
Accrued interest	10,500	10,500
Dividends payable	9,888	9,992
Asset retirement obligation - current portion	25,208	6,372
Other	616	318
Total accounts payable and accrued expenses	$ 151,811	$ 144,118	$ 116,512

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Sum of the carrying values as of the balance sheet date of obligations incurred through that date and due within one year (or the operating cycle, if longer), including liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received, taxes, interest, rent and utilities, accrued salaries and bonuses, payroll taxes and fringe benefits.

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