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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, 2016
Jun. 30, 2015
Dec. 31, 2015
General Electric Capital Corporation Credit Facility [Member] | Index Loan [Member]      
Line of Credit Facility [Line Items]      
Average daily loan balance outstanding   $ 3,900  
Line of Credit [Member] | CANADA [Member]      
Line of Credit Facility [Line Items]      
Maximum borrowing capacity $ 10,000    
JPMorgan Chase Bank Credit Agreement [Member]      
Line of Credit Facility [Line Items]      
Maximum borrowing capacity 250,000    
Line of credit facility, additional borrowing capacity $ 50,000    
Maturity date Oct. 31, 2020    
Additional available borrowing capacity $ 114,400    
Outstanding borrowings under credit facility $ 100,000   $ 47,400
Weighted average interest rate 1.90%   1.70%
Coverage ratio 1    
JPMorgan Chase Bank Credit Agreement [Member] | Pay Cash dividend [Member]      
Line of Credit Facility [Line Items]      
Agreement permissions $ 20,000    
JPMorgan Chase Bank Credit Agreement [Member] | Stock Repurchase [Member]      
Line of Credit Facility [Line Items]      
Agreement permissions 20,000    
JPMorgan Chase Bank Credit Agreement [Member] | The Credit Agreement Also Permits Acquisitions, Permissible Debt, Cash Dividend Payments And Stock Repurchases [Member]      
Line of Credit Facility [Line Items]      
Agreement permissions 20,000    
JPMorgan Chase Bank Credit Agreement [Member] | Minimum [Member] | Stock Repurchase [Member]      
Line of Credit Facility [Line Items]      
Borrowing base $ 25,000    
JPMorgan Chase Bank Credit Agreement [Member] | LIBOR [Member] | Minimum [Member]      
Line of Credit Facility [Line Items]      
Margin on variable rate 1.25%    
JPMorgan Chase Bank Credit Agreement [Member] | LIBOR [Member] | Maximum [Member]      
Line of Credit Facility [Line Items]      
Margin on variable rate 1.75%    
JPMorgan Chase Bank Credit Agreement [Member] | Index Loan [Member]      
Line of Credit Facility [Line Items]      
Average daily loan balance outstanding     $ 4,900
JPMorgan Chase Bank Credit Agreement [Member] | Alternate Base Rate [Member]      
Line of Credit Facility [Line Items]      
Outstanding borrowings under credit facility $ 8,000   $ 3,400
Weighted average interest rate 3.80%   3.80%
Average daily loan balance outstanding $ 3,000   $ 4,900
JPMorgan Chase Bank Credit Agreement [Member] | Alternate Base Rate [Member] | Minimum [Member]      
Line of Credit Facility [Line Items]      
Margin on variable rate 0.25%    
JPMorgan Chase Bank Credit Agreement [Member] | Alternate Base Rate [Member] | Maximum [Member]      
Line of Credit Facility [Line Items]      
Margin on variable rate 0.75%    
JPMorgan Chase Bank Credit Agreement [Member] | Fixed Assets Included in Borrowing Base [Member]      
Line of Credit Facility [Line Items]      
Borrowing base $ 31,250    
Borrowing base percentage 12.50%    
JPMorgan Chase Bank Credit Agreement [Member] | Fixed Assets Not Included in Borrowing Base [Member] | Maximum [Member]      
Line of Credit Facility [Line Items]      
Borrowing base $ 25,000    
Borrowing base percentage 10.00%    
JPMorgan Chase Bank Credit Agreement [Member] | Direct Borrowings [Member]      
Line of Credit Facility [Line Items]      
Outstanding borrowings under credit facility $ 92,000   $ 44,000
Weighted average interest rate 1.80%   1.60%