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Cash, cash equivalents and restricted cash (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Sep. 30, 2020
Dec. 31, 2019
Cash and cash equivalents $ 271,085 $ 203,479    
Long-term restricted cash 756 753    
Total cash, cash equivalents and restricted cash 271,841 $ 204,232 $ 212,717 $ 146,534
Letter of credit related to workers' compensation insurance 700      
Deposit related to customs activity 100      
Revolving credit facility        
Restricted cash which relates to support of outstanding letters of credit $ 800