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Long-term Debt and Line of Credit - Debt Maturity Schedule (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Debt Instrument [Line Items]    
Total debt $ 79,065 $ 85,941
Term Loan | Line of Credit    
Debt Instrument [Line Items]    
2019 3,000  
2020 3,750  
2021 4,500  
2022 5,250  
2023 42,000  
Total debt $ 58,500