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Credit Facilities and Long-Term Debt, Revolving Credit Facility (Details) - USD ($)
$ in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Line of Credit Facility [Abstract]      
Notes payable $ 130,000   $ 43,689
Fixed Assets Not Included in Borrowing Base [Member] | Maximum [Member]      
Line of Credit Facility [Abstract]      
Borrowing base $ 25,000    
Borrowing base percentage 10.00%    
Fixed Assets Included in Borrowing Base [Member]      
Line of Credit Facility [Abstract]      
Borrowing base $ 31,250    
Borrowing base percentage 12.50%    
JPMorgan Chase Bank Credit Agreement [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 $ 116,800    
Notes payable $ 130,000   $ 43,700
Weighted average interest rate 3.70%   3.90%
JPMorgan Chase Bank Credit Agreement [Member] | LIBOR [Member] | Minimum [Member]      
Line of Credit Facility [Abstract]      
Margin on variable rate 1.25%    
JPMorgan Chase Bank Credit Agreement [Member] | LIBOR [Member] | Maximum [Member]      
Line of Credit Facility [Abstract]      
Margin on variable rate 1.75%    
JPMorgan Chase Bank Credit Agreement [Member] | Alternate Base Rate [Member]      
Line of Credit Facility [Abstract]      
Notes payable     $ 3,700
Weighted average interest rate     5.80%
Average daily loan balance outstanding $ 1,600 $ 1,900 $ 1,800
JPMorgan Chase Bank Credit Agreement [Member] | Alternate Base Rate [Member] | Minimum [Member]      
Line of Credit Facility [Abstract]      
Margin on variable rate 0.25%    
JPMorgan Chase Bank Credit Agreement [Member] | Alternate Base Rate [Member] | Maximum [Member]      
Line of Credit Facility [Abstract]      
Margin on variable rate 0.75%    
JPMorgan Chase Bank Credit Agreement [Member] | Direct Borrowings [Member]      
Line of Credit Facility [Abstract]      
Notes payable $ 130,000   $ 40,000
Weighted average interest rate     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