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Other Balance Sheet Captions - Components of Accrued Expenses (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Components of Accrued Expenses [Abstract]    
Employee benefit plans $ 590 $ 1,288
Salaries and wages 3,189 7,099
Property taxes 1,445 1,248
Current operating lease liabilities 2,244 0
Other 1,915 2,079
Total $ 9,383 $ 11,714