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Long-term Debt, Line of Credit and Derivatives - Debt Maturity Schedule (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Debt Instrument [Line Items]    
Total debt $ 81,325 $ 79,065
Term Loan | Line of Credit    
Debt Instrument [Line Items]    
2019 1,500  
2020 3,750  
2021 4,500  
2022 5,250  
2023 42,000  
Total debt $ 57,000