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Long-term Debt, Line of Credit and Derivatives - Debt Maturity Schedule (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Debt Instrument [Line Items]    
Total debt $ 77,903 $ 85,941
Term Loan | Line of Credit    
Debt Instrument [Line Items]    
2018 10,125  
2019 15,188  
2020 50,062  
Total debt $ 75,375