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Credit Facilities and Long-Term Debt, Revolving Credit Facility (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
JPMorgan Chase Bank Credit Facility [Member]    
Line of Credit Facility [Abstract]    
Maximum borrowing capacity $ 250,000  
Line of credit facility, additional borrowing capacity $ 50,000  
Maturity date Dec. 31, 2023  
Additional available borrowing capacity $ 194,300  
Outstanding borrowings under credit facility 52,500 $ 43,700
Outstanding letters of credit $ 3,100 $ 3,100
Weighted average interest rate 3.50% 3.90%
JPMorgan Chase Bank Credit Facility [Member] | LIBOR [Member] | Minimum [Member]    
Line of Credit Facility [Abstract]    
Margin on variable rate 1.25%  
JPMorgan Chase Bank Credit Facility [Member] | LIBOR [Member] | Maximum [Member]    
Line of Credit Facility [Abstract]    
Margin on variable rate 1.75%  
JPMorgan Chase Bank Credit Facility [Member] | Alternate Base Rate [Member]    
Line of Credit Facility [Abstract]    
Outstanding borrowings under credit facility $ 12,500 $ 3,700
Weighted average interest rate 5.00% 5.80%
Average daily loan balance outstanding $ 1,700 $ 1,800
JPMorgan Chase Bank Credit Facility [Member] | Alternate Base Rate [Member] | Minimum [Member]    
Line of Credit Facility [Abstract]    
Margin on variable rate 0.25%  
JPMorgan Chase Bank Credit Facility [Member] | Alternate Base Rate [Member] | Maximum [Member]    
Line of Credit Facility [Abstract]    
Margin on variable rate 0.75%  
JPMorgan Chase Bank Credit Facility [Member] | Fixed Assets Included in Borrowing Base [Member] | Maximum [Member]    
Line of Credit Facility [Abstract]    
Borrowing base $ 25,000  
Borrowing base percentage 10.00%  
JPMorgan Chase Bank Credit Facility [Member] | Fixed Assets Not Included in Borrowing Base [Member]    
Line of Credit Facility [Abstract]    
Borrowing base $ 31,250  
Borrowing base percentage 12.50%  
JPMorgan Chase Bank Credit Facility [Member] | Direct Borrowings [Member]    
Line of Credit Facility [Abstract]    
Outstanding borrowings under credit facility $ 40,000 $ 40,000
Weighted average interest rate 2.30% 3.40%
Line of Credit [Member]    
Line of Credit Facility [Abstract]    
Coverage ratio 1  
Line of Credit [Member] | Pay Cash Dividend [Member]    
Line of Credit Facility [Abstract]    
Agreement permissions $ 20,000  
Line of Credit [Member] | Stock Repurchase [Member]    
Line of Credit Facility [Abstract]    
Agreement permissions 20,000  
Line of Credit [Member] | Stock Repurchase [Member] | Minimum [Member]    
Line of Credit Facility [Abstract]    
Borrowing base 25,000  
Line of Credit [Member] | Cash Dividend And Stock Repurchases [Member] | Minimum [Member]    
Line of Credit Facility [Abstract]    
Agreement permissions 20,000  
Line of Credit [Member] | CANADA [Member]    
Line of Credit Facility [Abstract]    
Maximum borrowing capacity $ 10,000