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Supplemental Disclosures to the Condensed Consolidated Balance Sheets and Condensed Consolidated Statements of Cash Flows - Accounts Payable and Accrued Expenses (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]    
Accounts payable-trade $ 7,996 $ 13,564
Accrued expenses 53,753 66,417
Royalties payable 13,900 26,189
Taxes other than income tax liability 9,867 10,766
Accrued interest 4,050 10,500
Dividends payable 10,251 9,992
Other 8,212 6,689
Total $ 108,028 $ 144,118