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Credit Facilities and Long-Term Debt, Revolving Credit Facility (Details) - USD ($)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Line of Credit Facility [Abstract]      
Outstanding borrowings under credit facility $ 8,416   $ 52,460
Revolving Credit Facility [Member]      
Line of Credit Facility [Abstract]      
Maximum borrowing capacity 250,000    
Line of credit facility, accordian feature $ 50,000    
Maturity date Dec. 31, 2023    
Additional available borrowing capacity $ 238,400    
Outstanding borrowings under credit facility 8,400   52,500
Outstanding letters of credit $ 3,100   $ 3,100
Weighted average interest rate 3.50%   3.50%
Coverage ratio 1    
Revolving Credit Facility [Member] | Pay Cash Dividend [Member]      
Line of Credit Facility [Abstract]      
Agreement permissions $ 20,000    
Revolving Credit Facility [Member] | Stock Repurchase [Member]      
Line of Credit Facility [Abstract]      
Agreement permissions 20,000    
Revolving Credit Facility [Member] | Stock Repurchase [Member] | Minimum [Member]      
Line of Credit Facility [Abstract]      
Borrowing base 25,000    
Revolving Credit Facility [Member] | Cash Dividend And Stock Repurchases [Member] | Minimum [Member]      
Line of Credit Facility [Abstract]      
Agreement permissions $ 20,000    
Revolving Credit Facility [Member] | LIBOR [Member] | Minimum [Member]      
Line of Credit Facility [Abstract]      
Margin on variable rate 1.25%    
Revolving Credit Facility [Member] | LIBOR [Member] | Maximum [Member]      
Line of Credit Facility [Abstract]      
Margin on variable rate 1.75%    
Revolving Credit Facility [Member] | Alternate Base Rate [Member]      
Line of Credit Facility [Abstract]      
Outstanding borrowings under credit facility $ 8,400   $ 12,500
Weighted average interest rate     5.00%
Average daily loan balance outstanding $ 1,300 $ 1,600 $ 1,700
Revolving Credit Facility [Member] | Alternate Base Rate [Member] | Minimum [Member]      
Line of Credit Facility [Abstract]      
Margin on variable rate 0.25%    
Revolving Credit Facility [Member] | Alternate Base Rate [Member] | Maximum [Member]      
Line of Credit Facility [Abstract]      
Margin on variable rate 0.75%    
Revolving Credit Facility [Member] | Fixed Assets Not Included in Borrowing Base [Member] | Maximum [Member]      
Line of Credit Facility [Abstract]      
Borrowing base $ 25,000    
Borrowing base percentage 10.00%    
Revolving Credit Facility [Member] | Fixed Assets Included in Borrowing Base [Member]      
Line of Credit Facility [Abstract]      
Borrowing base $ 31,250    
Borrowing base percentage 12.50%    
Revolving Credit Facility [Member] | Direct Borrowings [Member]      
Line of Credit Facility [Abstract]      
Outstanding borrowings under credit facility $ 0   $ 40,000
Weighted average interest rate 1.40%   2.30%
Revolving Credit Facility [Member] | Canada [Member]      
Line of Credit Facility [Abstract]      
Maximum borrowing capacity $ 10,000