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Cash, cash equivalents and restricted cash (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Jun. 30, 2018
Dec. 31, 2017
Cash and cash equivalents $ 136,340 $ 177,993    
Short-term and long-term restricted cash 6,824 6,909    
Total cash, cash equivalents and restricted cash 143,164 $ 184,902 $ 154,942 $ 140,880
Letter of credit related to workers' compensation insurance 700      
Letter of credit associated with bank guarantee two 100      
Deposit related to customs activity 100      
Revolving credit facility        
Restricted cash which relates to support of outstanding letters of credit 6,800      
Revolving credit facility | Beverly Property Owner LLC        
Letter of credit associated with security deposit for leaseback transaction $ 5,900