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Accounts Payable and Accrued Liabilities
 12 Months Ended
Dec. 31, 2020
Payables and Accruals [Abstract]  
Accounts Payable and Accrued Liabilities Accounts Payable and Accrued Liabilities
    Accounts payable and accrued liabilities at December 31, 2020 and 2019, consisted of the following (in thousands):
December 31,
20202019
Accounts payable$22,277 $16,793 
Accrued compensation23,212 23,988 
Accrued property and other taxes14,420 20,099 
Accrued severance and other charges2,666 5,837 
Income taxes16,029 19,166 
Affiliated (1)
2,513 1,694 
Accrued purchase orders and other18,869 32,744 
Total accounts payable and accrued liabilities$99,986 $120,321 
(1)Represents amounts owed to non-consolidated affiliates.