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Long-Term Debt (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2011
Subsidiaries [Member]
Jun. 22, 2011
Subsidiaries [Member]
Dec. 31, 2012
Interest Rate Swap [Member]
Dec. 31, 2011
Subordinated Debt [Member]
Subsidiaries [Member]
Jun. 30, 2008
Subordinated Debt [Member]
Line of Credit [Member]
Dec. 31, 2012
Maximum [Member]
Dec. 31, 2012
Minimum [Member]
Long-Term Debt (Textual) [Abstract]                  
Credit facility borrowing capacity $ 250.0     $ 16.0     $ 50.0    
Borrowing base availability maturity     30 days            
Percentage for base rate loans at the prime rate 3.25%       0.563%        
LIBOR rate loans               3.00% 2.75%
Company bank debt         75        
Borrowing rate line of credit           10.00%      
Loan payment from subsidiary           4.0      
Long-Term Debt (Additional Textual) [Abstract]                  
Maturity date of Amended and Restated Credit Agreement Jul. 30, 2014                
Maximum percentage of production 90.00%                
Restrictions on the payment of dividends, distributions or purchase of treasury stock 2.5                
Increased in the borrowing base 145.0                
Credit facility, interest rate description The Company’s borrowing rates in the credit facility provide for base rate loans at the prime rate (3.25% at December 31, 2012) plus applicable margin utilization rates that range from 1.75% to 2.0%, and LIBO rate loans at LIBO published rates plus applicable utilization rates (2.75% to 3.00% at December 31, 2012). As of December 31, 2012, the Company had in place one base rate loan and one LIBO rate loan with effective rates of 5.00% and 2.97%, respectively                
Minimum range for applicable margin utilization rate 1.75%                
Maximum range for applicable margin utilization rate 2.00%                
Debt instrument interest one base rate basis for effective rate 5.00%                
Effective LIBOR Loan Rate 2.97%                
Credit facility current borrowing capacity 122.0                
Weighted-average interest rate of borrowings 3.17%                
Credit facility remaining borrowing capacity $ 23.0                
Debt instrument basis weighted average interest rate spread on variable rate 3.81% 4.78%              
Interest swap agreements period 2 years