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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