Quarterly report pursuant to Section 13 or 15(d)

Debt and Credit Arrangements - Narrative (Details)

v3.20.2
Debt and Credit Arrangements - Narrative (Details)
3 Months Ended 9 Months Ended
Mar. 31, 2020
USD ($)
Sep. 30, 2020
USD ($)
Dec. 31, 2019
USD ($)
Line of Credit Facility [Line Items]      
Revolving credit facility   $ 67,000,000 $ 55,000,000
Current portion of long-term debt   40,000,000.0 $ 35,000,000
Revolving credit facility | Line of Credit      
Line of Credit Facility [Line Items]      
Proceeds from Lines of Credit $ 60,000,000.0    
Revolving credit facility   67,000,000.0  
Credit Agreement | Citibank, National Association      
Line of Credit Facility [Line Items]      
Aggregate secured revolving credit facility   $ 150,000,000.0  
All-in rate   3.04%  
Credit Agreement | Citibank, National Association | Federal Funds Rate      
Line of Credit Facility [Line Items]      
Interest rate   0.50%  
Credit Agreement | Citibank, National Association | LIBOR rate      
Line of Credit Facility [Line Items]      
Interest rate   1.00%  
Credit Agreement | Citibank, National Association | Maximum      
Line of Credit Facility [Line Items]      
Leverage Ratio   3.25  
Credit Agreement | Citibank, National Association | Maximum | LIBOR rate      
Line of Credit Facility [Line Items]      
Interest rate   350.00%  
Credit Agreement | Citibank, National Association | Minimum      
Line of Credit Facility [Line Items]      
Interest Coverage Ratio   1.75  
Credit Agreement | Citibank, National Association | Minimum | LIBOR rate      
Line of Credit Facility [Line Items]      
Interest rate   225.00%