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Long-term Debt, Line of Credit and Derivatives - Provisions of the term loan (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Debt Instrument [Line Items]      
Current portion of debt $ 3,000    
Periodic payment, principal 800    
Repayments of debt 10,750 $ 8,375  
Long-term debt, excluding current maturities 54,800    
Term Loan | Line of Credit      
Debt Instrument [Line Items]      
Line of credit facility, maximum borrowing capacity     $ 60,000
Fair value of amount outstanding $ 57,800    
Term Loan | Line of Credit | London Interbank Offered Rate (LIBOR)      
Debt Instrument [Line Items]      
Interest rate, effective percentage 5.25%