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Long-term Debt, Line of Credit and Derivatives - Obligations under Debt Arrangements (Details) - USD ($)
$ in Thousands
1 Months Ended 9 Months Ended
Jun. 30, 2020
May 31, 2019
Mar. 31, 2019
Jul. 31, 2018
Sep. 30, 2020
Sep. 30, 2019
Jun. 08, 2020
Dec. 31, 2019
Debt Instrument [Line Items]                
Amortization of debt issuance costs         $ 529 $ 312    
Principal current         4,500     $ 3,750
Principal, long-term         37,565     69,540
Principal         42,065     73,290
Deferred Issuance Costs, current         (153)     (82)
Deferred Issuance Costs, long-term         (1,280)     (1,511)
Debt Issuance Costs, Net, Total         (1,433)     (1,593)
Net Value, current         4,347     3,668
Net Value, long-term         36,285     68,029
Total debt         $ 40,632     71,697
Line of Credit                
Debt Instrument [Line Items]                
Weighted average interest rate         2.58%      
Revolving Credit Facility | Line of Credit                
Debt Instrument [Line Items]                
Line of credit facility, maximum borrowing capacity         $ 50,000      
Debt issuance expense   $ 400            
Principal, long-term         10,000     36,000
Deferred Issuance Costs, long-term         (341)     (782)
Net Value, long-term         9,659     35,218
Term Loan | Line of Credit                
Debt Instrument [Line Items]                
Line of credit facility, maximum borrowing capacity         60,000      
Principal current         4,500     3,750
Principal, long-term         27,565     33,540
Principal         32,065      
Deferred Issuance Costs, current         (153)     (82)
Deferred Issuance Costs, long-term         (939)     (729)
Net Value, current         4,347     3,668
Net Value, long-term         26,626     $ 32,811
364-Day Revolving Credit Facility | Line of Credit                
Debt Instrument [Line Items]                
Line of credit facility, maximum borrowing capacity             $ 20,000  
Debt issuance expense $ 400              
Fourth, Fifth And Sixth Amendments To Credit Agreement | Line of Credit                
Debt Instrument [Line Items]                
Debt Issuance Costs, Net, Total         $ (900)      
Fourth Amendment to Credit Agreement | Line of Credit                
Debt Instrument [Line Items]                
Debt issuance cost       $ 900        
Fifth Amendment To Credit Agreement | Line of Credit                
Debt Instrument [Line Items]                
Debt issuance cost     $ 600          
Sixth Amendment To Credit Agreement | Line of Credit                
Debt Instrument [Line Items]                
Debt issuance cost   $ 900