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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, 2021
Sep. 30, 2020
Dec. 31, 2020
Line of Credit Facility [Abstract]      
Outstanding borrowings under credit facility $ 128,938   $ 10,000
Revolving Credit Facility [Member]      
Line of Credit Facility [Abstract]      
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] | 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] | Fixed Assets Not Included in Borrowing Base [Member] | Maximum [Member]      
Line of Credit Facility [Abstract]      
Borrowing base $ 25,000    
Borrowing base percentage 10.00%    
JPMorgan Chase Bank, N.A. [Member] | 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 $ 118,400    
Outstanding borrowings under credit facility 128,900   10,000
Outstanding letters of credit $ 2,600   $ 2,800
Weighted average interest rate 1.40%   1.40%
JPMorgan Chase Bank, N.A. [Member] | Revolving Credit Facility [Member] | Canada [Member]      
Line of Credit Facility [Abstract]      
Maximum borrowing capacity $ 10,000    
JPMorgan Chase Bank, N.A. [Member] | Revolving Credit Facility [Member] | LIBOR [Member] | Minimum [Member]      
Line of Credit Facility [Abstract]      
Margin on variable rate 1.25%    
JPMorgan Chase Bank, N.A. [Member] | Revolving Credit Facility [Member] | LIBOR [Member] | Maximum [Member]      
Line of Credit Facility [Abstract]      
Margin on variable rate 1.75%    
JPMorgan Chase Bank, N.A. [Member] | Revolving Credit Facility [Member] | Direct Borrowings [Member]      
Line of Credit Facility [Abstract]      
Outstanding borrowings under credit facility $ 125,000    
Weighted average interest rate 1.30%    
JPMorgan Chase Bank, N.A. [Member] | Revolving Credit Facility [Member] | Alternate Base Rate [Member]      
Line of Credit Facility [Abstract]      
Outstanding borrowings under credit facility $ 3,900    
Weighted average interest rate 3.50%    
Average daily loan balance outstanding $ 1,000 $ 1,300 $ 1,500
JPMorgan Chase Bank, N.A. [Member] | Revolving Credit Facility [Member] | Alternate Base Rate [Member] | Minimum [Member]      
Line of Credit Facility [Abstract]      
Margin on variable rate 0.25%    
JPMorgan Chase Bank, N.A. [Member] | Revolving Credit Facility [Member] | Alternate Base Rate [Member] | Maximum [Member]      
Line of Credit Facility [Abstract]      
Margin on variable rate 0.75%