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Credit Arrangement (Details) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended
Mar. 31, 2020
Mar. 31, 2020
Mar. 31, 2019
Credit Agreement [Abstract]      
Proceeds from borrowings   $ 43,800 $ 0
Credit Agreement [Member]      
Credit Agreement [Abstract]      
Maximum borrowing capacity $ 60,000 60,000  
Covenant limit for unused availability to pay dividends 12,500 $ 12,500  
Proceeds from borrowings $ 43,800    
Weighted average interest rate 2.37% 2.37%  
Current borrowing base $ 58,400 $ 58,400  
Outstanding letters of credit 0 0  
Net availability $ 14,600 $ 14,600  
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%