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Long-term Debt, Line of Credit and Derivatives - Debt Maturity Schedule (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Debt Instrument [Line Items]    
Total debt $ 79,559 $ 101,265
Term Loan | Line of Credit    
Debt Instrument [Line Items]    
2017 3,375  
2018 13,500  
2019 15,188  
2020 50,062  
Total debt $ 82,125