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Accrued Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Payables and Accruals [Abstract]    
Salaries, wages and bonuses $ 28,296 $ 22,598
Taxes 5,130 6,621
Warranty 10,249 4,992
Retirement Provision 2,795 2,646
Customer Deposits 2,430 2,520
Other 10,786 4,408
Accrued liabilities $ 59,686 $ 43,785