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Other Accrued Liabilities
 12 Months Ended
Dec. 31, 2021
Payables and Accruals [Abstract]  
Other Accrued Liabilities Other Accrued Liabilities
    
Other accrued liabilities at December 31, 2021 and 2020 consisted of the following (in thousands):
December 31,
20212020
Accrued payroll and other employee benefits$19,710 $14,916 
Gross environmental credit obligations (1)311,014 150,482 
Other39,700 38,313 
Total$370,424 $203,711 
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(1)Gross environmental credit obligations are stated at market as of December 31, 2021 and 2020. Please read Note 15—Fair Value Measurements for further information. A portion of these obligations are expected to be settled with our RINs assets and other environmental credits, which are presented as Inventories on our consolidated balance sheet and are stated at the lower of cost and net realizable value. The carrying costs of these assets were $120.1 million and $26.7 million as of December 31, 2021 and 2020, respectively.