Annual report pursuant to Section 13 and 15(d)

Long-Term Debt (Narrative) (Details)

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Long-Term Debt (Narrative) (Details) (USD $)
 12 Months Ended 12 Months Ended 0 Months Ended 12 Months Ended 0 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2012
Senior Notes [Member]
Dec. 21, 2012
Senior Notes [Member]
Oct. 17, 2012
Senior Notes [Member]
Oct. 09, 2012
Senior Notes [Member]
Dec. 31, 2011
Senior Notes [Member]
Dec. 31, 2012
Building Loans [Member]
Dec. 31, 2011
Building Loans [Member]
Mar. 31, 2011
Building Loans [Member]
Oct. 09, 2012
Maximum [Member]
Senior Notes [Member]
Oct. 09, 2012
Minimum [Member]
Senior Notes [Member]
Dec. 24, 2010
Amegy Bank National Association [Member]
Sep. 30, 2010
Amegy Bank National Association [Member]
Oct. 31, 2011
Nova Scotia, KeyBank, Societe Generale [Member]
May 03, 2011
Nova Scotia, KeyBank, Societe Generale [Member]
May 02, 2012
Credit Suisse, Deutche Bank, IberiaBank,KeyBank,Amegy Bank, Nova Scotia [Member]
Dec. 18, 2012
Nova Scotia, Amegy, KeyBank [Member]
Dec. 31, 2012
Nova Scotia, Amegy, KeyBank [Member]
Oct. 19, 2012
Nova Scotia, Amegy, KeyBank [Member]
Oct. 17, 2012
Nova Scotia, Amegy, KeyBank [Member]
Dec. 31, 2012
Nova Scotia, Amegy, KeyBank [Member]
Interest Expense [Member]
Dec. 18, 2012
Nova Scotia, Amegy, KeyBank [Member]
Senior Notes [Member]
Oct. 17, 2012
Nova Scotia, Amegy, KeyBank [Member]
Senior Notes [Member]
Oct. 09, 2012
Nova Scotia, Amegy, KeyBank [Member]
Senior Notes [Member]
Dec. 18, 2012
Base Rate Loans [Member]
Nova Scotia, Amegy, KeyBank [Member]
Oct. 19, 2012
Base Rate Loans [Member]
Nova Scotia, Amegy, KeyBank [Member]
Oct. 17, 2012
Base Rate Loans [Member]
Nova Scotia, Amegy, KeyBank [Member]
Dec. 18, 2012
Euro Dollar Loans [Member]
Nova Scotia, Amegy, KeyBank [Member]
Oct. 19, 2012
Euro Dollar Loans [Member]
Nova Scotia, Amegy, KeyBank [Member]
Oct. 17, 2012
Euro Dollar Loans [Member]
Nova Scotia, Amegy, KeyBank [Member]
Dec. 18, 2012
Federal Funds Rate [Member]
Base Rate Loans [Member]
Nova Scotia, Amegy, KeyBank [Member]
Oct. 17, 2012
Eurodollar [Member]
Nova Scotia, Amegy, KeyBank [Member]
Dec. 18, 2012
Eurodollar [Member]
Base Rate Loans [Member]
Nova Scotia, Amegy, KeyBank [Member]
Debt Instrument [Line Items]                                                                    
Revolving credit facility                           $ 100,000,000   $ 350,000,000         $ 45,000,000                          
Borrowing capacity                         65,000,000 50,000,000 125,000,000 90,000,000 155,000,000 40,000,000     45,000,000                          
Amount of current credit facility used to repay former credit facility                           42,000,000                                        
Amount of current credit facility used to repay term loan                           2,500,000                                        
Applicable rate, minimum                                                   0.75% 0.75% 1.00% 1.75% 1.75% 2.00%      
Applicable rate, maximum                                                   1.50% 1.50% 1.75% 2.50% 2.50% 2.75%      
Commitment fee percentage                                       0.375% 0.50%                          
Senior unsecured notes issued                                             50,000,000 250,000,000 300,000,000                  
Stated interest rate     7.75%             5.82%                         7.75% 7.75%                    
Write-off of deferred loan costs 1,143,000 0                                 55,000     1,088,000                        
Basis spread                                                               0.50%   1.00%
Debt instrument, description of rate                                   LIBOR01                                
Interest rate at period end                                                                 2.97%  
Ratio of funded debt to EBITDAX necessary to maintain covenants 2                                                                  
Minimum ratio of EBITDAX to interest expense 3                                                                  
Building Loan Oustandind Amount Of Buidling Loan Refinanced 302,143,000   300,000,000 [1]       0 [1] 2,143,000 [2] 2,283,000 [2] 2,400,000                                                
Loan, periodic payment               22,000                                                    
Debt issued       50,000,000 250,000,000                                                          
Redemption of principal amount plus aggregate net proceeds           100.00%         35.00%                                              
Percentage of notes required to be outstanding for redemption                       65.00%                                            
Discount price       101.00% 98.534%                                                          
Unamortized discount 3,595,000       3,665,000                                                          
Effective interest rate       7.531% 8.00%                                                          
Unamortized premium $ 490,000     $ 500,000                                                            
[1] On October 17, 2012, the Company issued the $250.0 million October Notes to qualified institutional buyers pursuant to Rule 144A under the Securities Act and to certain non-U.S. persons in accordance with Regulation S under the Securities Act, (the "October Notes Offering") under an indenture among the Company, its subsidiary guarantors and Wells Fargo Bank, National Association, as the trustee, (the "senior note indenture"). On December 21, 2012, the Company issued an additional $50.0 million in aggregate principal amount of December Notes, to qualified institutional buyers pursuant to Rule 144A under the Securities Act and to certain non-U.S. persons in accordance with Regulation S under the Securities Act, ("the December Notes Offering"). The December Notes were issued as additional securities under the senior note indenture. The October Notes Offering and the December Notes Offering are collectively referred to as the "Notes Offerings". The Company used a portion of the net proceeds from the October Notes Offering to repay all amounts outstanding at such time under its revolving credit facility. The Company intends to use the remaining net proceeds of October Notes Offering and the net proceeds of the December Notes Offering for general corporate purposes, which may include funding a portion of its 2013 capital development plan. Under the senior note indenture, interest on the Notes accrues at a rate of 7.750% per annum on the outstanding principal amount from October 17, 2012, payable semi-annually on May 1 and November 1 of each year, commencing on May 1, 2013. The Notes are the Company's senior unsecured obligations and rank equally in the right of payment with all of the Company's other senior indebtedness and senior in right of payment to any future subordinated indebtedness. All of the Company's existing and future restricted subsidiaries that guarantee the Company's secured revolving credit facility or certain other debt guarantee the Notes; provided, however, that the Notes are not guaranteed by Grizzly Holdings, Inc. and will not be guaranteed by any of the Company's future unrestricted subsidiaries. The Company may redeem some or all of the Notes at any time on or after November 1, 2016, at the redemption prices listed in the senior note indenture. Prior to November 1, 2016, the Company may redeem the Notes at a price equal to 100% of the principal amount plus a “make-whole” premium. In addition, prior to November 1, 2015, the Company may redeem up to 35% of the aggregate principal amount of the Notes with the net proceeds of certain equity offerings, provided that at least 65% of the aggregate principal amount of the Notes initially issued remains outstanding immediately after such redemption.
[2] In March 2011, the Company entered into a new building loan agreement for the office building it occupies in Oklahoma City, Oklahoma. The new loan agreement refinanced the $2.4 million outstanding under the previous building loan agreement. The new agreement matures in February 2016 and bears interest at the rate of 5.82% per annum. The new building loan requires monthly interest and principal payments of approximately $22,000 and is collateralized by the Oklahoma City office building and associated land.