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Credit Arrangement (Details) - USD ($)
$ in Thousands
1 Months Ended 12 Months Ended
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Credit Agreement [Abstract]          
Proceeds from borrowings     $ 43,800 $ 0 $ 0
Repayment of borrowings     43,800 0 0
Interest paid     365 $ 126 $ 2,425
Credit Agreement [Member]          
Credit Agreement [Abstract]          
Proceeds from borrowings   $ 43,800      
Repayment of borrowings $ 43,800        
Maximum borrowing capacity     $ 60,000    
Maturity date     Sep. 27, 2024    
Covenant limit for unused availability to pay dividends     $ 12,500    
Weighted average interest rate     2.37%    
Interest paid     $ 400    
Borrowing base     15,300    
Outstanding letters of credit     0    
Net availability     $ 15,300    
Credit Agreement [Member] | Euro Dollar LIBOR Rate [Member]          
Credit Agreement [Abstract]          
Term of variable interest rate     3 months    
Basis spread on variable rate     1.25%