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Short-term and long-term debt (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Short-term debt:    
- Revolving credit line and other debt $ 14,000 $ 29,000
- Long-term debt, current 3,008 2,672
- Less: deferred financing costs on term loan (3,136) (3,325)
Subtotal 17,008 31,672
Long-term debt:    
- Term Loan Facility 85,115 101,588
- Vehicle and equipment loans   4
- Capital lease obligations 3 6
Subtotal 81,982 98,273
Total short-term & long-term debt $ 98,990 $ 129,945