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Other Accrued Liabilities
6 Months Ended
Jun. 30, 2021
Payables and Accruals [Abstract]  
Other Accrued Liabilities Other Accrued Liabilities
Other accrued liabilities at June 30, 2021 and December 31, 2020 consisted of the following (in thousands):

June 30, 2021December 31, 2020
Accrued payroll and other employee benefits$16,603 $14,916 
Gross environmental credit obligations (1)354,486 150,482 
Other32,678 38,313 
Total$403,767 $203,711 
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(1)Gross environmental credit obligations are stated at market as of June 30, 2021 and December 31, 2020. Please read Note 11—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 condensed consolidated balance sheet and are stated at the lower of cost and net realizable value. The carrying costs of these assets were $60.6 million and $26.7 million as of June 30, 2021 and December 31, 2020, respectively.