Quarterly report pursuant to Section 13 or 15(d)

Accrued Liabilities and Other (Schedule of Accrued Liabilities and Other Balances) (Details)

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Accrued Liabilities and Other (Schedule of Accrued Liabilities and Other Balances) (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Accrued Liabilities and Other [Abstract]    
Accrued accounts payable invoices $ 7,475 $ 4,070
Joint venture audit settlement 7,921 3,960
Derivative liability - current 4,244  
Contingent payment 5,000  
Capital expenditures 2,364 435
Stock appreciation rights - current portion 2,792 2,289
Accrued wages and other compensation 940 2,108
Other 3,041 4,322
Total accrued liabilities and other $ 33,777 $ 17,184